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Document And Entity Information	3 Months Ended
Oct. 27, 2012	Nov. 15, 2012
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct 27, 2012
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2013
Trading Symbol	CSCO
Entity Registrant Name	CISCO SYSTEMS, INC.
Entity Central Index Key	0000858877
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--07-27
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		5,309,248,366

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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Current assets:
Cash and cash equivalents	$ 4,773	$ 9,799
Investments	40,227	38,917
Accounts receivable, net of allowance for doubtful accounts of $224 at October 27, 2012 and $207 at July 28, 2012	3,942	4,369
Inventories	1,709	1,663
Financing receivables, net	3,726	3,661
Deferred tax assets	2,253	2,294
Other current assets	1,277	1,230
Total current assets	57,907	61,933
Property and equipment, net	3,409	3,402
Financing receivables, net	3,695	3,585
Goodwill	20,443	16,998
Purchased intangible assets, net	3,449	1,959
Other assets	3,740	3,882
TOTAL ASSETS	92,643	91,759
Current liabilities:
Short-term debt	55	31
Accounts payable	889	859
Income taxes payable	200	276
Accrued compensation	2,710	2,928
Deferred revenue	8,721	8,852
Other current liabilities	4,539	4,785
Total current liabilities	17,114	17,731
Long-term debt	16,272	16,297
Income taxes payable	1,577	1,844
Deferred revenue	3,902	4,028
Other long-term liabilities	1,077	558
Total liabilities	39,942	40,458
Commitments and contingencies (Note 12)
Cisco shareholders' equity:
Preferred stock, no par value: 5 shares authorized; none issued and outstanding	0	0
Common stock and additional paid-in capital, $0.001 par value: 20,000 shares authorized; 5,311 and 5,298 shares issued and outstanding at October 27, 2012 and July 28, 2012, respectively	39,290	39,271
Retained earnings	12,563	11,354
Accumulated other comprehensive income	833	661
Total Cisco shareholders' equity	52,686	51,286
Noncontrolling interests	15	15
Total equity	52,701	51,301
TOTAL LIABILITIES AND EQUITY	$ 92,643	$ 91,759

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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 224	$ 207
Preferred Stock, No Par Value	$ 0	$ 0
Preferred stock, shares authorized	5	5
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	20,000	20,000
Common stock, shares issued	5,311	5,298
Common stock, shares outstanding	5,311	5,298

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Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
NET SALES:
Product	$ 9,297	$ 8,952
Service	2,579	2,304
Total net sales	11,876	11,256
COST OF SALES:
Product	3,748	3,563
Service	889	803
Total cost of sales	4,637	4,366
GROSS MARGIN	7,239	6,890
OPERATING EXPENSES:
Research and development	1,431	1,375
Sales and marketing	2,416	2,452
General and administrative	560	552
Amortization of purchased intangible assets	122	99
Restructuring and other charges	59	202
Total operating expenses	4,588	4,680
OPERATING INCOME	2,651	2,210
Interest income	161	164
Interest expense	(148)	(148)
Other income (loss), net	(33)	19
Interest and other income, net	(20)	35
INCOME BEFORE PROVISION FOR INCOME TAXES	2,631	2,245
Provision for income taxes	539	468
NET INCOME	$ 2,092	$ 1,777
Net income per share-basic (in dollars per share)	$ 0.39	$ 0.33
Net income per share-diluted (in dollars per share)	$ 0.39	$ 0.33
Shares used in per-share calculation-basic (in shares)	5,301	5,394
Shares used in per-share calculation-diluted (in shares)	5,334	5,407
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.06

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Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Statement of Income and Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 2,092	$ 1,777
Change in net unralized gains, net of tax benefit of $1 and $26 for the three months ended October 27, 2012 and October 29, 2011, respectively	4	(53)
Net gains reclassified into earnings, net of tax effects of $10 and $2 for the three months ended October 27, 2012 and October 29, 2011, respectively	(17)	(6)
Total available-for-sale investments	(13)	(59)
Change in unrealized gains and losses	66	(50)
Net losses reclassified into earnings	5	0
Total cash flow hedging instruments	71	(50)
Net change in cumulative translation adjustment and other, net of tax (expense) benefit of $(10) and $21 for the three months ended October 27, 2012 and October 29, 2011, respectively	114	(211)
Other comprehensive income (loss)	172	(320)
Comprehensive income	2,264	1,457
Comprehensive loss attributable to noncontrolling interests	0	7
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,264	$ 1,464

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Consolidated Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ 1	$ 26
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	10	2
Change in cumulative translation tax effects	$ (10)	$ 21

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Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Cash flows from operating activities:
Net income	$ 2,092	$ 1,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and other	612	621
Share-based compensation expense	306	341
Provision for doubtful accounts	29	(13)
Deferred income taxes	135	109
Excess tax benefits from share-based compensation	(15)	(21)
Net losses (gains) on investments	15	(13)
Change in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	615	399
Inventories	42	(168)
Financing receivables	(132)	(9)
Other assets	99	(374)
Accounts payable	(19)	36
Income taxes, net	(372)	(38)
Accrued compensation	(359)	(548)
Deferred revenue	(295)	232
Other liabilities	(288)	2
Net cash provided by operating activities	2,465	2,333
Cash flows from investing activities:
Purchases of investments	(8,213)	(11,770)
Proceeds from sales of investments	2,447	7,721
Proceeds from maturities of investments	4,388	1,179
Acquisition of property and equipment	(265)	(265)
Acquisition of businesses, net of cash and cash equivalents acquired	(4,912)	(38)
Purchases of investments in privately held companies	(9)	(153)
Return of Investments In Privately Held Companies	12	58
Other	22	77
Net cash used in investing activities	(6,530)	(3,191)
Cash flows from financing activities:
Issuances of common stock	117	203
Repurchases of stock- repurchase program	(183)	(1,744)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(203)	(137)
Short-term borrowings, maturities less than 90 days, net	23	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	15	21
Dividends paid	(744)	(322)
Other	14	(78)
Net cash used in financing activities	(961)	(2,057)
Net decrease in cash and cash equivalents	(5,026)	(2,915)
Cash and cash equivalents, beginning of fiscal year	9,799	7,662
Cash and cash equivalents, end of fiscal year	4,773	4,747
Cash paid for:
Interest	221	220
Income taxes	$ 776	$ 398

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Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified	Total USD ($)	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Stockholder Equity Excluding Portion Attributable To Noncontrolling Interest [Member] USD ($)	Noncontrolling Interest [Member] USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 30, 2011							$ 33
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 30, 2011	47,259
Shares, Issued at Jul. 30, 2011		5,435
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jul. 30, 2011			38,648	7,284	1,294	47,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	1,777			1,777		1,777
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	(320)				(313)	(313)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(7)
Stock Issued During Period, Shares, New Issues		45
Stock Issued During Period, Value, New Issues	203		203			203
Repurchased Shares And Retired During Period Shares		(100)
Stock Repurchased During Period, Value	(1,544)		(715)	(829)		(1,544)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(9)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(137)		(137)			(137)
Cash dividends declared	(322)			(322)		(322)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(43)		(43)			(43)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	341		341			341
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 29, 2011							26
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 29, 2011	47,214
Shares, Issued at Oct. 29, 2011		5,371
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Oct. 29, 2011			38,297	7,910	981	47,188
Stockholders' Equity Attributable to Noncontrolling Interest at Jul. 28, 2012	15						15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jul. 28, 2012	51,301
Shares, Issued at Jul. 28, 2012		5,298
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Jul. 28, 2012			39,271	11,354	661	51,286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	2,092			2,092		2,092
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax	172				172	172
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
Stock Issued During Period, Shares, New Issues		39
Stock Issued During Period, Value, New Issues	117		117			117
Repurchased Shares And Retired During Period Shares		(15)
Stock Repurchased During Period, Value	(253)		(114)	(139)		(253)
Shares Repurchased In Settlement Of Employee Tax Withholding Obligations Shares		(11)
Stock Repurchased for tax withholdings on vesting of restricted stock units, value	(203)		(203)			(203)
Cash dividends declared	(744)			(744)		(744)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(87)		(87)			(87)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	306		306			306
Stockholders' Equity Attributable to Noncontrolling Interest at Oct. 27, 2012	15						15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 27, 2012	52,701
Shares, Issued at Oct. 27, 2012		5,311
Stockholders' Equity Excluding Portion Attributable to Noncontrolling Interest at Oct. 27, 2012			$ 39,290	$ 12,563	$ 833	$ 52,686

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Consolidated Statements Of Equity Consolidated Statements of Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Common Stock, Dividends, Per Share, Declared	$ 0.14	$ 0.06
Cumulative stock repurchased and retired shares	3,755
Cumulative Stock Repurchased And Retired Value	$ 76,386
Parent [Member]
Cumulative Stock Repurchased And Retired Value	76,386
Retained Earnings [Member]
Cumulative Stock Repurchased And Retired Value	59,231
Common Stock Including Additional Paid in Capital [Member]
Cumulative Stock Repurchased And Retired Value	$ 17,155
Common Stock [Member]
Cumulative stock repurchased and retired shares	3,755

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Supplemental Information	3 Months Ended
Oct. 27, 2012
Stockholders' Equity Note [Abstract]
Treasury Stock [Text Block]	In September 2001, the Company’s Board of Directors authorized a stock repurchase program. As of October 27, 2012, the Company’s Board of Directors had authorized an aggregate repurchase of up to $82 billion of common stock under this program with no termination date. For additional information regarding stock repurchases, see Note 13 to the Consolidated Financial Statements. The stock repurchases since the inception of this program and the related impacts on Cisco shareholders’ equity are summarized in the following table (in millions):     Shares of Common Stock   Common Stock and Additional Paid-In Capital   Retained Earnings   Total Cisco Shareholders’ Equity Repurchases of common stock under the repurchase program 3,755   $ 17,155   $ 59,231   $ 76,386

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Basis Of Presentation	3 Months Ended
Oct. 27, 2012
Basis Of Presentation [Abstract]
Basis Of Presentation	Basis of Presentation The fiscal year for Cisco Systems, Inc. (the "Company" or "Cisco") is the 52 or 53 weeks ending on the last Saturday in July. Fiscal 2013 and fiscal 2012 are each 52-week fiscal years. The Consolidated Financial Statements include the accounts of Cisco and its subsidiaries. All significant intercompany accounts and transactions have been eliminated. The Company conducts business globally and is primarily managed on a geographic basis in the following three geographic segments: the Americas; Europe, Middle East, and Africa ("EMEA"); and Asia Pacific, Japan, and China ("APJC"). The accompanying financial data as of October 27, 2012 and for the three months ended October 27, 2012 and October 29, 2011 has been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The July 28, 2012 Consolidated Balance Sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and the notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended July 28, 2012. The Company consolidates its investment in a venture fund managed by SOFTBANK Corp. and its affiliates ("SOFTBANK") and Insieme Networks, Inc. ("Insieme") as these are variable interest entities and the Company is the primary beneficiary. The noncontrolling interests attributed to SOFTBANK are presented as a separate component from the Company's equity in the equity section of the Consolidated Balance Sheets. SOFTBANK's share of the earnings in the venture fund and the loss attributable to the noncontrolling interests in Insieme are not presented separately in the Consolidated Statements of Operations as these amounts are not material for any of the fiscal periods presented. In the opinion of management, all adjustments (which include normal recurring adjustments, except as disclosed herein) necessary to present fairly the statement of financial position as of October 27, 2012 and the results of operations, cash flows, and equity for the three months ended October 27, 2012 and October 29, 2011, as applicable, have been made. The results of operations for the three months ended October 27, 2012 are not necessarily indicative of the operating results for the full fiscal year or any future periods. Certain reclassifications have been made to prior period amounts in order to conform to the current period's presentation. The Company has evaluated subsequent events through the date that the financial statements were issued.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies	3 Months Ended
Oct. 27, 2012
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a) New Accounting Updates Recently Adopted In June 2011, the FASB issued an accounting standard update to provide guidance on increasing the prominence of items reported in other comprehensive income, which eliminated the option to present components of other comprehensive income as part of the statement of equity. The Company adopted this accounting standard in the first quarter of fiscal 2013. In August 2011, the FASB approved a revised accounting standard update intended to simplify how an entity tests goodwill for impairment. The amendment will allow an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity no longer will be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013, and its adoption did not have any impact on the Company's Consolidated Financial Statements. (b) Recent Accounting Standards or Updates Not Yet Effective In December 2011, the FASB issued an accounting standard update requiring enhanced disclosures about certain financial instruments and derivative instruments that are offset in the statement of financial position or that are subject to enforceable master netting arrangements or similar agreements. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2014, at which time the Company will include the required disclosures. In July 2012, the FASB issued an accounting standard update intended to simplify how an entity tests indefinite-lived intangible assets other than goodwill for impairment by providing entities with an option to perform a qualitative assessment to determine whether further impairment testing is necessary. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2014, and early adoption is permitted. The adoption of this accounting standard update is not expected to have a material impact on the Company's Consolidated Financial Statements.

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Business Combinations	3 Months Ended
Oct. 27, 2012
Business Combinations [Abstract]
Business Combinations	Business Combinations (a) Acquisition Summary On July 30, 2012, the Company completed its acquisition of NDS Group Limited (“NDS”), a leading provider of video software and content security solutions that enable service providers and media companies to securely deliver and monetize new video entertainment experiences. The acquisition of NDS is expected to complement and accelerate the delivery of Cisco Videoscape, the Company's comprehensive content delivery platform that enables service providers and media companies to deliver next-generation entertainment experiences. With the NDS acquisition, the Company aims to broaden its opportunities in the service provider market and to expand its reach into emerging markets such as China and India, where NDS has an established customer presence. Under the terms of the acquisition agreement, the Company paid total cash consideration of approximately $5.0 billion, which included the repayment of $993 million of pre-existing NDS debt to third party creditors at the closing of the acquisition. The following table summarizes the purchase consideration for the NDS acquisition (in millions):     Fair Value Cash consideration to seller   $ 4,012 Repayment of NDS debt to third party creditors   993 Total purchase consideration   $ 5,005 The payment of the total purchase consideration of approximately $5.0 billion shown above, net of $98 million cash and cash equivalents acquired, is classified as a use of cash under investing activities in the Consolidated Statements of Cash Flows. The Company's purchase price allocation for NDS is preliminary and subject to revision as additional information about fair value of assets and liabilities becomes available. Additional information, which existed as of the acquisition date but at that time was unknown to the Company, may become known to the Company during the remainder of the measurement period, a period not to exceed 12 months from the acquisition date. Adjustments in the purchase price allocation may require a recasting of the amounts allocated to goodwill retroactive to the period in which the acquisition occurred. A summary of the preliminary allocation of the total purchase consideration for NDS is presented as follows (in millions):     Fair Value Cash and cash equivalents   $ 98 Accounts receivable, net   199 Other tangible assets   268 Goodwill   3,444 Purchased intangible assets   1,746 Deferred tax liabilities, net   (378 ) Liabilities assumed   (372 ) Total purchase consideration   $ 5,005 The Company completed three additional business combinations during the three months ended October 27, 2012 for a total cash consideration of $5 million. A summary of the allocation of the total purchase consideration is presented as follows (in millions):   Purchase Consideration   Net Liabilities Assumed   Purchased Intangible Assets   Goodwill All other acquisitions $ 5   $ (3 )   $ 7   $ 1 The total cash and cash equivalents acquired from these business combinations were immaterial. (b) Other Acquisition Information Total transaction costs related to the Company's business combination activities were $6 million and $2 million for the three months ended October 27, 2012 and October 29, 2011, respectively. These transaction costs were expensed as incurred as general and administrative ("G&A") expenses. The goodwill generated from the Company's business combinations completed during the three months ended October 27, 2012 is primarily related to expected synergies. The goodwill is generally not deductible for U.S. federal income tax purposes. The Consolidated Financial Statements include the operating results of each business combination from the date of acquisition. Pro forma results of operations for the acquisitions completed during the three months ended October 27, 2012 have not been presented because the effects of the acquisitions, individually and in the aggregate, were not material to the Company's financial results. (c) Pending Acquisition of Meraki Inc. On November 18, 2012, the Company announced that it had entered into a definitive agreement to acquire privately held Meraki Inc. (“Meraki”), a leader in cloud networking.  Meraki offers mid-market customers on-premise networking solutions centrally managed from the cloud that are easy to deploy and manage. With its acquisition of Meraki, the Company intends to address the rapidly occurring shift to cloud networking as a key part of the Company's overall strategy to accelerate the adoption of software-based business models that provide new consumption options for customers and revenue opportunities for partners. Under the terms of the agreement, the Company will pay approximately $1.2 billion in cash to acquire Meraki. The acquisition is expected to close in the second quarter of fiscal year 2013 and is subject to customary closing conditions, including regulatory review.

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Goodwill And Purchased Intangible Assets	3 Months Ended
Oct. 27, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Purchased Intangible Assets	Goodwill and Purchased Intangible Assets (a) Goodwill The following table presents the goodwill allocated to the Company's reportable segments as of and during the three months ended October 27, 2012 (in millions):     Balance at July 28, 2012   Acquisition of NDS   All Other Acquisitions   Balance at October 27, 2012 Americas   $ 11,755   $ 1,230   $ 1   $ 12,986 EMEA   3,287   1,327   —   4,614 APJC   1,956   887   —   2,843 Total   $ 16,998   $ 3,444   $ 1   $ 20,443 (b) Purchased Intangible Assets The following table presents details of the Company's intangible assets acquired through business combinations completed during the three months ended October 27, 2012 (in millions, except years):   FINITE LIVES   INDEFINITE LIVES   TOTAL   TECHNOLOGY   CUSTOMER RELATIONSHIPS   OTHER   IPR&D     Weighted- Average Useful Life (in Years)   Amount   Weighted- Average Useful Life (in Years)   Amount   Weighted- Average Useful Life (in Years)   Amount   Amount   Amount NDS Group Limited 6.4   $ 807   6.7   $ 818   7.4   $ 27   $ 94   $ 1,746 All other acquisitions 3.0   7   —   —   —   —   —   7 Total     $ 814       $ 818       $ 27   $ 94   $ 1,753 The following tables present details of the Company’s purchased intangible assets (in millions):  October 27, 2012   Gross   Accumulated Amortization   Net Purchased intangible assets with finite lives:             Technology   $ 3,053   $ (1,027 )   $ 2,026 Customer relationships   3,079   (1,780 )   1,299 Other   73   (43 )   30 Total purchased intangible assets with finite lives   6,205   (2,850 )   3,355 In-process research and development, with indefinite lives   94   —   94 Total   $ 6,299   $ (2,850 )   $ 3,449 July 28, 2012   Gross   Accumulated Amortization   Net Purchased intangible assets with finite lives:             Technology   $ 2,267   $ (908 )   $ 1,359 Customer relationships   2,261   (1,669 )   592 Other   49   (41 )   8 Total   $ 4,577   $ (2,618 )   $ 1,959   Purchased intangible assets include intangible assets acquired through business combinations as well as through direct purchases or licenses. The following table presents the amortization of purchased intangible assets (in millions):     Three Months Ended     October 27, 2012   October 29, 2011 Amortization of purchased intangible assets:         Cost of sales   $ 143   $ 96 Operating expenses   122   99 Total   $ 265   $ 195 There were no impairment charges related to purchased intangible assets during the three months ended October 27, 2012 and October 29, 2011. The estimated future amortization expense of purchased intangible assets with finite lives as of October 27, 2012 is as follows (in millions): Fiscal Year   Amount 2013 (remaining nine months)   $ 702 2014   785 2015   701 2016   474 2017   325 Thereafter   368 Total   $ 3,355

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Restructuring And Other Charges	3 Months Ended
Oct. 27, 2012
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	5. Restructuring and Other Charges In fiscal 2011, the Company initiated a number of key targeted actions to address several areas in its business model. These actions were intended to simplify and focus the Company's organization and operating model, align the Company's cost structure given transitions in the marketplace, divest or exit underperforming operations, and deliver value to the Company's shareholders. The Company initiated these actions to align its business based on its five foundational priorities: leadership in its core business (routing, switching, and associated services), which includes comprehensive security and mobility solutions; collaboration; data center virtualization and cloud; video; and architectures for business transformation. Pursuant to the restructuring that the Company announced in July 2011, the Company has incurred cumulative charges of approximately $1.1 billion (included as part of the charges discussed below). The Company has substantially completed the July 2011 restructuring and does not expect significant remaining charges related to these actions. The following table summarizes the activities related to the restructuring and other charges pursuant to the Company's July 2011 announcement related to the realignment and restructuring of the Company's business as well as certain consumer product lines as announced during April 2011 (in millions):     Voluntary Early Retirement Program   Employee Severance   Goodwill and Intangible Assets   Other   Total Gross charges in fiscal 2011   $ 453   $ 247   $ 71   $ 28   $ 799 Cash payments   (436 )   (13 )   —   —   (449 ) Non-cash items   —   —   (71 )   (17 )   (88 ) BALANCE AT JULY 30, 2011   $ 17   $ 234   $ —   $ 11   $ 262 Gross charges in fiscal 2012   —   299   —   54   353 Change in estimate related to fiscal 2011 charges   —   (49 )   —   —   (49 ) Cash payments   (17 )   (401 )   —   (18 )   (436 ) Non-cash items   —   —   —   (20 )   (20 ) BALANCE AT JULY 28, 2012   $ —   $ 83 $ — $ 27 $ 110 Charges in fiscal 2013   —   65   —   (6 )   59 Cash payments   —   (89 )   —   (7 )   (96 ) Non-cash items   —   —   —   (1 )   (1 ) BALANCE AT OCTOBER 27, 2012   $ —   $ 59   $ —   $ 13   $ 72

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Balance Sheet Details	3 Months Ended
Oct. 27, 2012
Disclosure Balance Sheet Details [Abstract]
Balance Sheet Details	Balance Sheet Details The following tables provide details of selected balance sheet items (in millions):     October 27, 2012   July 28, 2012 Inventories:         Raw materials   $ 101   $ 127 Work in process   36   35 Finished goods:         Distributor inventory and deferred cost of sales   671   630 Manufactured finished goods   615   597 Total finished goods   1,286   1,227 Service-related spares   237   213 Demonstration systems   49   61           Total   $ 1,709   $ 1,663           Property and equipment, net:         Land, buildings, and building and leasehold improvements   $ 4,458   $ 4,363 Computer equipment and related software   1,491   1,469 Production, engineering, and other equipment   5,495   5,364 Operating lease assets (1)   312   300 Furniture and fixtures   494   487     12,250   11,983 Less accumulated depreciation and amortization (1)   (8,841 )   (8,581 ) Total   $ 3,409   $ 3,402           (1)      Accumulated depreciation related to operating lease assets was $192 and $181 as of October 27, 2012 and July 28, 2012, respectively.            Other assets:         Deferred tax assets   $ 2,061   $ 2,270 Investments in privately held companies   830   858 Other   849   754 Total   $ 3,740   $ 3,882           Deferred revenue:         Service   $ 8,753   $ 9,173 Product:         Unrecognized revenue on product shipments and other deferred revenue   3,074   2,975 Cash receipts related to unrecognized revenue from two-tier distributors   796   732 Total product deferred revenue   3,870   3,707 Total   $ 12,623   $ 12,880 Reported as:         Current   $ 8,721   $ 8,852 Noncurrent   3,902   4,028 Total   $ 12,623   $ 12,880

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Financing Receivables And Guarantees	3 Months Ended
Oct. 27, 2012
Financing Receivables And Guarantees [Abstract]
Financing Receivables And Guarantees	Financing Receivables and Guarantees (a) Financing Receivables Financing receivables primarily consist of lease receivables, loan receivables, and financed service contracts and other. Lease receivables represent sales-type and direct-financing leases resulting from the sale of the Company's and complementary third-party products and are typically collateralized by a security interest in the underlying assets. Loan receivables represent financing arrangements related to the sale of the Company's products and services, which may include additional funding for other costs associated with network installation and integration of the Company's products and services. Lease receivables consist of arrangements with terms of four years on average, while loan receivables generally have terms of up to three years. The financed service contracts and other category includes financing receivables related to technical support and advanced services, as well as receivables related to financing of certain indirect costs associated with leases. Revenue related to the technical support services is typically deferred and included in deferred service revenue and is recognized ratably over the period during which the related services are to be performed, which typically ranges from one to three years. A summary of the Company’s financing receivables is presented as follows (in millions): October 27, 2012 Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Financing Receivables Gross $ 3,601   $ 1,816   $ 2,639   $ 8,056 Unearned income (261 )   —   —   (261 ) Allowance for credit loss (248 )   (114 )   (12 )   (374 ) Total, net $ 3,092   $ 1,702   $ 2,627   $ 7,421 Reported as:               Current $ 1,310   $ 947   $ 1,469   $ 3,726 Noncurrent 1,782   755   1,158   3,695 Total, net $ 3,092   $ 1,702   $ 2,627   $ 7,421 July 28, 2012 Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Financing Receivables Gross $ 3,429   $ 1,796   $ 2,651   $ 7,876 Unearned income (250 )   —   —   (250 ) Allowance for credit loss (247 )   (122 )   (11 )   (380 ) Total, net $ 2,932   $ 1,674   $ 2,640   $ 7,246 Reported as:               Current 1,200   968   1,493   3,661 Noncurrent 1,732   706   1,147   3,585 Total, net $ 2,932   $ 1,674   $ 2,640   $ 7,246 As of October 27, 2012 and July 28, 2012, the deferred service revenue related to the financed service contracts and other was $1,810 million and $1,838 million, respectively. Contractual maturities of the gross lease receivables at October 27, 2012 are summarized as follows (in millions): Fiscal Year   Amount 2013 (remaining nine months)   $ 1,199 2014   1,205 2015   732 2016   342 2017   123 Total   $ 3,601 Actual cash collections may differ from the contractual maturities due to early customer buyouts, refinancings, or defaults. (b) Credit Quality of Financing Receivables Financing receivables categorized by the Company's internal credit risk rating as of October 27, 2012 and July 28, 2012 are summarized as follows (in millions):   INTERNAL CREDIT RISK RATING             October 27, 2012 1 to 4   5 to 6   7 and Higher   Total   Residual Value   Gross Receivables, Net of Unearned Income Lease receivables $ 1,602   $ 1,417   $ 42   $ 3,061   $ 279   $ 3,340 Loan receivables 945   834   37   1,816   —   1,816 Financed service contracts and other 1,531   1,010   98   2,639   —   2,639 Total $ 4,078   $ 3,261   $ 177   $ 7,516   $ 279   $ 7,795   INTERNAL CREDIT RISK RATING             July 28, 2012 1 to 4   5 to 6   7 and  Higher   Total   Residual Value   Gross Receivables, Net of Unearned Income Lease receivables $ 1,532   $ 1,342   $ 31   $ 2,905   $ 274   $ 3,179 Loan receivables 831   921   44   1,796   —   1,796 Financed service contracts and other 1,552   1,030   69   2,651   —   2,651 Total $ 3,915   $ 3,293   $ 144   $ 7,352   $ 274   $ 7,626 The Company determines the adequacy of its allowance for credit loss by assessing the risks and losses inherent in its financing receivables by portfolio segment. The portfolio segment is based on the types of financing offered by the Company to its customers: lease receivables, loan receivables, and financed service contracts and other. The Company's internal credit risk ratings of 1 through 4 correspond to investment-grade ratings, while credit risk ratings of 5 and 6 correspond to non-investment grade ratings. Credit risk ratings of 7 and higher correspond to substandard ratings and constitute a relatively small portion of the Company's financing receivables. In circumstances when collectability is not deemed reasonably assured, the associated revenue is deferred in accordance with the Company's revenue recognition policies, and the related allowance for credit loss, if any, is included in deferred revenue. The Company also records deferred revenue associated with financing receivables when there are remaining performance obligations, as it does for financed service contracts. Total allowances for credit loss and deferred revenue as of October 27, 2012 and July 28, 2012 were $2,321 million, and $2,387 million, respectively, and they were associated with financing receivables (net of unearned income) of $7,795 million and $7,626 million as of their respective period ends. The losses that the Company has incurred historically, including in the periods presented with respect to its financing receivables, have been immaterial and consistent with the performance of an investment-grade portfolio. The Company did not modify any financing receivables during the periods presented. The following tables present the aging analysis of financing receivables as of October 27, 2012 and July 28, 2012 (in millions):   DAYS PAST DUE (INCLUDES BILLED AND UNBILLED)                 October 27, 2012 31-60   61-90    91+   Total Past Due   Current   Gross Receivables, Net of Unearned Income   Non-Accrual Financing Receivables   Impaired Financing Receivables Lease receivables $ 88   $ 76   $ 206   $ 370   $ 2,970   $ 3,340   $ 23   $ 15 Loan receivables 6   —   23   29   1,787   1,816   6   6 Financed service contracts and other 64   130   477   671   1,968   2,639   16   7 Total $ 158   $ 206   $ 706   $ 1,070   $ 6,725   $ 7,795   $ 45   $ 28   DAYS PAST DUE (INCLUDES BILLED AND UNBILLED)                 July 28, 2012 31-60   61-90    91+   Total Past Due   Current   Gross Receivables, Net of Unearned Income   Non-Accrual Financing Receivables   Impaired Financing Receivables Lease receivables $ 151   $ 69   $ 173   $ 393   $ 2,786   $ 3,179   $ 23   $ 14 Loan receivables 10   8   11   29   1,767   1,796   4   4 Financed service contracts and other 89   68   392   549   2,102   2,651   18   10 Total $ 250   $ 145   $ 576   $ 971   $ 6,655   $ 7,626   $ 45   $ 28 Past due financing receivables are those that are 31 days or more past due according to their contractual payment terms. The data in the preceding tables is presented by contract, and the aging classification of each contract is based on the oldest outstanding receivable, and therefore past due amounts also include unbilled and current receivables within the same contract. The balances of either unbilled or current financing receivables included in the category of 91 days plus past due for lease receivables, loan receivables, and financed service contracts and other were, respectively, $157 million, $15 million, and $377 million as of October 27, 2012; and were, respectively, $139 million, $3 million, and $313 million as of July 28, 2012. As of October 27, 2012, the Company had financing receivables of $140 million, net of unbilled or current receivables from the same contract, that were in the category for 91 days plus past due but remained on accrual status. Such balance was $109 million as of July 28, 2012. A financing receivable may be placed on nonaccrual status earlier if, in management's opinion, a timely collection of the full principal and interest becomes uncertain. (c) Allowance for Credit Loss Rollforward The allowances for credit loss and the related financing receivables are summarized as follows (in millions):   CREDIT LOSS ALLOWANCES   Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Allowance for credit loss as of July 28, 2012 $ 247   $ 122   $ 11   $ 380 Provisions, net (2 )   (10 )   1   (11 ) Foreign exchange and other 3   2   —   5 Allowance for credit loss as of October 27, 2012 $ 248   $ 114   $ 12   $ 374 Gross receivables as of October 27, 2012, net of unearned income $ 3,340   $ 1,816   $ 2,639   $ 7,795   CREDIT LOSS ALLOWANCES   Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Allowance for credit loss as of July 30, 2011 $ 237   $ 103   $ 27   $ 367 Provisions, net 2   5   2   9 Foreign exchange and other (6 )   (5 )   —   (11 ) Allowance for credit loss as of October 29, 2011 $ 233   $ 103   $ 29   $ 365 Gross receivables as of October 29, 2011, net of unearned income $ 2,849   $ 1,468   $ 2,557   $ 6,874 The Company assesses the allowance for credit loss related to financing receivables on either an individual or a collective basis. The Company considers various factors in evaluating lease and loan receivables and the earned portion of financed service contracts for possible impairment on an individual basis. These factors include the Company's historical experience, credit quality and age of the receivable balances, and economic conditions that may affect a customer's ability to pay. When the evaluation indicates that it is probable that all amounts due pursuant to the contractual terms of the financing agreement, including scheduled interest payments, are unable to be collected, the financing receivable is considered impaired. All such outstanding amounts, including any accrued interest, will be assessed and fully reserved at the customer level. Typically, the Company also considers receivables with a risk rating of 8 or higher to be impaired and will include them in the individual assessment for allowance. Financing receivables that were individually evaluated for impairment during the periods presented were not material and therefore are not presented separately in the preceding tables. The Company evaluates the remainder of its financing receivables portfolio for impairment on a collective basis and records an allowance for credit loss at the portfolio segment level. When evaluating the financing receivables on a collective basis, the Company uses expected default frequency rates published by a major third-party credit-rating agency as well as its own historical loss rate in the event of default, while also systematically giving effect to economic conditions, concentration of risk and correlation. (d) Financing Guarantees In the ordinary course of business, the Company provides financing guarantees for various third-party financing arrangements extended to channel partners and end-user customers. Payments under these financing guarantee arrangements were not material for the periods presented. Channel Partner Financing Guarantees   The Company facilitates arrangements for third-party financing extended to channel partners, consisting of revolving short-term financing, generally with payment terms ranging from 60 to 90 days. These financing arrangements facilitate the working capital requirements of the channel partners, and, in some cases, the Company guarantees a portion of these arrangements. The volume of channel partner financing was $5.6 billion and $5.3 billion for the three months ended October 27, 2012 and October 29, 2011, respectively. The balance of the channel partner financing subject to guarantees was $1.4 billion and $1.5 billion as of October 27, 2012 and October 29, 2011, respectively. End-User Financing Guarantees   The Company also provides financing guarantees for third-party financing arrangements extended to end-user customers related to leases and loans, which typically have terms of up to three years. The volume of financing provided by third parties for leases and loans as to which the Company had provided guarantees was $44 million and $35 million for the three months ended October 27, 2012 and October 29, 2011, respectively. Financing Guarantee Summary   The aggregate amounts of financing guarantees outstanding at October 27, 2012 and July 28, 2012, representing the total maximum potential future payments under financing arrangements with third parties along with the related deferred revenue, are summarized in the following table (in millions):     October 27, 2012   July 28, 2012 Maximum potential future payments relating to financing guarantees:       Channel partner $ 372   $ 277 End user 243   232 Total $ 615   $ 509 Deferred revenue associated with financing guarantees:       Channel partner $ (221 )   $ (193 ) End user (215 )   (200 ) Total $ (436 )   $ (393 ) Maximum potential future payments relating to financing guarantees, net of associated deferred revenue $ 179   $ 116

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Investments	3 Months Ended
Oct. 27, 2012
Investments [Abstract]
Investments	Investments (a) Summary of Available-for-Sale Investments The following tables summarize the Company’s available-for-sale investments (in millions): October 27, 2012 Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value Fixed income securities:               U.S. government securities $ 26,401   $ 22   $ (9 )   $ 26,414 U.S. government agency securities 4,441   14   —   4,455 Non-U.S. government and agency securities 1,388   8   —   1,396 Corporate debt securities 6,105   96   (2 )   6,199 Total fixed income securities 38,335   140   (11 )   38,464 Publicly traded equity securities 1,263   512   (12 )   1,763 Total $ 39,598   $ 652   $ (23 )   $ 40,227 July 28, 2012 Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value Fixed income securities:               U.S. government securities $ 24,201   $ 41   $ (1 )   $ 24,241 U.S. government agency securities 5,367   21   —   5,388 Non-U.S. government and agency securities 1,629   9   —   1,638 Corporate debt securities 5,959   74   (3 )   6,030 Total fixed income securities 37,156   145   (4 )   37,297 Publicly traded equity securities 1,107   524   (11 )   1,620 Total $ 38,263   $ 669   $ (15 )   $ 38,917 U.S. government agency securities include corporate debt securities that are guaranteed by the Federal Deposit Insurance Corporation ("FDIC"), while non-U.S. government and agency securities include agency and corporate debt securities that are guaranteed by non-U.S. governments. (b) Gains and Losses on Available-for-Sale Investments The following table presents the gross realized gains and gross realized losses related to the Company’s available-for-sale investments (in millions): Three Months Ended October 27, 2012   October 29, 2011 Gross realized gains $ 72   $ 236 Gross realized losses (45 )   (227 ) Total $ 27   $ 9 The following table presents the realized net gains (losses) related to the Company's available-for-sale investments by security type (in millions): Three Months Ended October 27, 2012   October 29, 2011 Net gains (losses) on investments in publicly traded equity securities $ 10   $ (16 ) Net gains on investments in fixed income securities 17   25          Total $ 27   $ 9 There were no impairment charges on available-for-sale investments for the periods presented. The following tables present the breakdown of the available-for-sale investments with gross unrealized losses and the duration that those losses had been unrealized at October 27, 2012 and July 28, 2012 (in millions):   UNREALIZED LOSSES LESS THAN 12 MONTHS   UNREALIZED LOSSES 12 MONTHS OR GREATER   TOTAL October 27, 2012 Fair Value   Gross Unrealized Losses   Fair Value   Gross Unrealized Losses   Fair Value   Gross  Unrealized  Losses Fixed income securities:                       U.S. government agency securities  $ 12,477   $ (9 )   $ —   $ —   $ 12,477   $ (9 ) Corporate debt securities 469   (2 )   —   —   469   (2 ) Total fixed income securities 12,946   (11 )   —   —   12,946   (11 ) Publicly traded equity securities 270   (12 )   —   —   270   (12 ) Total $ 13,216   $ (23 )   $ —   $ —   $ 13,216   $ (23 )   UNREALIZED LOSSES LESS THAN 12 MONTHS   UNREALIZED LOSSES 12 MONTHS OR GREATER   TOTAL July 28, 2012 Fair Value   Gross Unrealized Losses   Fair Value   Gross Unrealized Losses   Fair Value   Gross  Unrealized  Losses Fixed income securities:                       U.S. government agency securities  $ 5,357   $ (1 )   $ —   $ —   $ 5,357   $ (1 ) Corporate debt securities 603   (3 )   14   —   617   (3 ) Total fixed income securities 5,960   (4 )   14   —   5,974   (4 ) Publicly traded equity securities 167   (8 )   20   (3 )   187   (11 ) Total $ 6,127   $ (12 )   $ 34   $ (3 )   $ 6,161   $ (15 ) As of October 27, 2012, for fixed income securities that were in unrealized loss positions, the Company has determined that (i) it does not have the intent to sell any of these investments and (ii) it is not more likely than not that it will be required to sell any of these investments before recovery of the entire amortized cost basis. In addition, as of October 27, 2012, the Company anticipates that it will recover the entire amortized cost basis of such fixed income securities and has determined that no other-than-temporary impairments associated with credit losses were required to be recognized during the three months ended October 27, 2012. The Company has evaluated its publicly traded equity securities as of October 27, 2012 and has determined that there was no indication of other-than-temporary impairments in the respective categories of unrealized losses. This determination was based on several factors, which include the length of time and extent to which fair value has been less than the cost basis, the financial condition and near-term prospects of the issuer, and the Company's intent and ability to hold the publicly traded equity securities for a period of time sufficient to allow for any anticipated recovery in market value. (c) Maturities of Fixed Income Securities The following table summarizes the maturities of the Company’s fixed income securities at October 27, 2012 (in millions):    Amortized Cost   Fair Value Less than 1 year $ 17,224   $ 17,238 Due in 1 to 2 years 10,763   10,798 Due in 2 to 5 years 10,265   10,339 Due after 5 years 83   89 Total $ 38,335   $ 38,464 Actual maturities may differ from the contractual maturities because borrowers may have the right to call or prepay certain obligations. (d) Securities Lending The Company periodically engages in securities lending activities with certain of its available-for-sale investments. These transactions are accounted for as a secured lending of the securities, and the securities are typically loaned only on an overnight basis. The average daily balance of securities lending for the three months ended October 27, 2012 and October 29, 2011 was $0.8 billion and $0.6 billion, respectively. The Company requires collateral equal to at least 102% of the fair market value of the loaned security in the form of cash or liquid, high-quality assets. The Company engages in these secured lending transactions only with highly creditworthy counterparties, and the associated portfolio custodian has agreed to indemnify the Company against collateral losses. The Company did not experience any losses in connection with the secured lending of securities during the periods presented. As of October 27, 2012 and July 28, 2012, the Company had no outstanding securities lending transactions.

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Fair Value	3 Months Ended
Oct. 27, 2012
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be either recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact, and it also considers assumptions that market participants would use when pricing the asset or liability. (a) Fair Value Hierarchy The accounting guidance for fair value measurement requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities. Level 2 applies to assets or liabilities for which there are inputs other than quoted prices that are observable for the asset or liability such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets); or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data. Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities. (b) Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities measured at fair value on a recurring basis as of October 27, 2012 and July 28, 2012 were as follows (in millions):   OCTOBER 27, 2012 FAIR VALUE MEASUREMENTS   JULY 28, 2012 FAIR VALUE MEASUREMENTS   Level 1   Level 2   Level 3   Total Balance   Level 1   Level 2   Level 3   Total Balance Assets                               Cash equivalents:                               Money market funds $ 2,373   $ —   $ —   $ 2,373   $ 2,506   $ —   $ —   $ 2,506 Available-for-sale investments:                               U.S. government securities —   26,414   —   26,414   —   24,241   —   24,241 U.S. government agency securities —   4,455   —   4,455   —   5,388   —   5,388 Non-U.S. government and agency securities —   1,396   —   1,396   —   1,638   —   1,638 Corporate debt securities —   6,199   —   6,199   —   6,030   —   6,030 Publicly traded equity securities 1,763   —   —   1,763   1,620   —   —   1,620 Derivative assets —   273   1   274   —   263   1   264 Total $ 4,136   $ 38,737   $ 1   $ 42,874   $ 4,126   $ 37,560   $ 1   $ 41,687 Liabilities:                               Derivative liabilities $ —   $ 55   $ —   $ 55   $ —   $ 42   $ —   $ 42 Total $ —   $ 55   $ —   $ 55   $ —   $ 42   $ —   $ 42 Level 2 fixed income securities are priced using quoted market prices for similar instruments or nonbinding market prices that are corroborated by observable market data. The Company uses inputs such as actual trade data, benchmark yields, broker/dealer quotes, and other similar data, which are obtained from quoted market prices, independent pricing vendors, or other sources, to determine the ultimate fair value of these assets and liabilities. The Company uses such pricing data as the primary input to make its assessments and determinations as to the ultimate valuation of its investment portfolio and has not made, during the periods presented, any material adjustments to such inputs. The Company is ultimately responsible for the financial statements and underlying estimates. The Company's derivative instruments are primarily classified as Level 2, as they are not actively traded and are valued using pricing models that use observable market inputs. The Company did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented. Level 3 assets include certain derivative instruments, the values of which are determined based on discounted cash flow models using inputs that the Company could not corroborate with market data. There was no activity related to assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended October 27, 2012. The following table presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended October 29, 2011 (in millions):   Asset-Backed Securities   Derivative Assets   Total Balance at July 30, 2011 $ 121   $ 2   $ 123 Total gains and losses (realized and unrealized):           Included in other income (loss), net —   (1 )   (1 ) Sales and maturities (5 )   —   (5 ) Balance at October 29, 2011 $ 116   $ 1   $ 117 Losses attributable to assets still held as of October 29, 2011 $ —   $ (1 )   $ (1 ) (c) Assets Measured at Fair Value on a Nonrecurring Basis The following table presents the Company’s financial instruments and nonfinancial assets that were measured at fair value on a nonrecurring basis during the indicated periods and the related recognized gains and losses for the periods (in millions):     October 27, 2012   October 29, 2011     Net Carrying Value as of End of Period   Total Losses for the Period Ended   Net Carrying Value as of End of Period   Total Losses for the Period Ended Investments in privately held companies   $ 42   $ 10   $ 1   $ 1 Property held for sale   $ —   —   $ 24   89 Total losses for nonrecurring measurements       $ 10       $ 90 The assets in the preceding table were measured at fair value due to events or circumstances the Company identified as having significant impact on their fair value during the respective periods. To arrive at the valuation of these assets, the Company considers any significant changes in the financial metrics and economic variables, and also uses third-party valuation reports to assist in the valuation as necessary. These assets were classified as Level 3 assets because the Company used unobservable inputs to value them. The fair value measurement of the impaired investments was classified as Level 3 because significant unobservable inputs were used in the valuation due to the absence of quoted market prices and inherent lack of liquidity. Significant unobservable inputs, which included financial metrics of comparable private and public companies, financial condition and near-term prospects of the investees, recent financing activities of the investees, and the investees' capital structure as well as other economic variables, reflected the assumptions market participants would use in pricing these assets. The impairment charges, representing the difference between the cost and the fair value as a result of the evaluation, were recorded to other income (loss), net. The property held for sale represents land and buildings which met the criteria to be classified as held for sale. The fair value of property held for sale was measured with the assistance of third-party valuation models which used discounted cash flow techniques as part of their analysis. The fair value measurement was categorized as Level 3 as significant unobservable inputs were used in the valuation report. The impairment charges as a result of the valuations, which represented the difference between the fair value less cost to sell and the carrying amount of the assets held for sale, were included in G&A expenses. (d) Other Fair Value Disclosures The carrying value of the Company's investments in privately held companies that were accounted for under the cost method was $239 million and $249 million as of October 27, 2012 and July 28, 2012, respectively. It was not practicable to estimate the fair value of this portfolio. The fair value of the Company's short-term loan receivables and financed service contracts approximates their carrying value due to their short duration. The aggregate carrying value of the Company's long-term loan receivables and financed service contracts and other as of each October 27, 2012 and July 28, 2012 was $1.9 billion. The estimated fair value of the Company's long-term loan receivables and financed service contracts and other approximates their carrying value. The Company uses significant unobservable inputs in determining discounted cash flows to estimate the fair value of its long-term loan receivables and financed service contracts, and therefore they are categorized as Level 3. As of October 27, 2012, the fair value of the Company's long-term debt was $18.7 billion with a carrying amount of $16.3 billion. This compares to a fair value of $18.8 billion and a carrying amount of $16.3 billion as of July 28, 2012. The fair value of the long-term debt was determined based on observable market prices in a less active market and was categorized as Level 2 in the fair value hierarchy.

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Borrowings	3 Months Ended
Oct. 27, 2012
Debt Disclosure [Abstract]
Borrowings	Borrowings (a) Short-Term Debt The following table summarizes the Company’s short-term debt (in millions, except percentages):   October 27, 2012   July 28, 2012   Amount   Weighted-Average Interest Rate   Amount   Weighted-Average Interest Rate Other notes and borrowings $ 55   7.75 %   $ 31   6.72 % In fiscal 2011, the Company established a short-term debt financing program of up to $3.0 billion through the issuance of commercial paper notes. The Company uses the proceeds from the issuance of commercial paper notes for general corporate purposes. The Company had no commercial paper outstanding as of each of October 27, 2012 and July 28, 2012. Other notes and borrowings in the preceding table consist of notes and credit facilities established with a number of financial institutions that are available to certain foreign subsidiaries of the Company. These notes and credit facilities are subject to various terms and foreign currency market interest rates pursuant to individual financial arrangements between the financing institution and the applicable foreign subsidiary. As of October 27, 2012, the estimated fair value of the short-term debt approximates its carrying value due to the short maturities. (b) Long-Term Debt The following table summarizes the Company's long-term debt (in millions, except percentages):   October 27, 2012   July 28, 2012   Amount   Effective Rate   Amount   Effective Rate Senior Notes:               Floating-rate notes, due 2014 $ 1,250   0.71%   $ 1,250   0.81% 1.625% fixed-rate notes, due 2014 2,000   0.76%   2,000   0.84% 2.90% fixed-rate notes, due 2014 500   3.11%   500   3.11% 5.50% fixed-rate notes, due 2016 3,000   3.14%   3,000   3.16% 3.15% fixed-rate notes, due 2017 750   0.96%   750   1.03% 4.95% fixed-rate notes, due 2019 2,000   5.08%   2,000   5.08% 4.45% fixed-rate notes, due 2020 2,500   4.50%   2,500   4.50% 5.90% fixed-rate notes, due 2039 2,000   6.11%   2,000   6.11% 5.50% fixed-rate notes, due 2040 2,000   5.67%   2,000   5.67% Total 16,000       16,000     Other long-term debt 10   0.19%   10   0.19% Unaccreted discount (68 )       (70 )     Hedge accounting fair value adjustments 330       357     Total long-term debt $ 16,272       $ 16,297     To achieve its interest rate risk management objectives, the Company entered into interest rate swaps with an aggregate notional amount of $4.25 billion designated as fair value hedges of certain of its fixed-rate senior notes. In effect, these swaps convert the fixed interest rates of the fixed-rate notes to floating interest rates based on the London InterBank Offered Rate ("LIBOR"). The gains and losses related to changes in the fair value of the interest rate swaps substantially offset changes in the fair value of the hedged portion of the underlying debt that are attributable to the changes in market interest rates. See Note 11 to the Consolidated Financial Statements. The effective rates for the fixed-rate debt include the interest on the notes, the accretion of the discount, and, if applicable, adjustments related to hedging. Interest is payable semiannually on each class of the senior fixed-rate notes and payable quarterly on the floating-rate notes. Each of the senior fixed-rate notes is redeemable by the Company at any time, subject to a make-whole premium.  The senior notes rank at par with the commercial paper notes that may be issued in the future pursuant to the Company's short-term debt financing program, as discussed earlier under "Short-Term Debt". As of October 27, 2012, the Company was in compliance with all debt covenants. Future principal payments for long-term debt as of October 27, 2012 are summarized as follows (in millions): Fiscal Year Amount 2013 (remaining nine months) $ — 2014 3,260 2015 500 2016 3,000 2017 750 Thereafter 8,500 Total $ 16,010 (c) Credit Facility On February 17, 2012, the Company entered into a credit agreement with certain institutional lenders that provides for a $3.0 billion unsecured revolving credit facility that is scheduled to expire on February 17, 2017. Any advances under the credit agreement will accrue interest at rates that are equal to, based on certain conditions, either (i) the higher of the Federal Funds rate plus 0.50%, Bank of America's "prime rate" as announced from time to time, or one-month LIBOR plus 1.00%, or (ii) LIBOR plus a margin that is based on the Company's senior debt credit ratings as published by Standard & Poor's Financial Services, LLC and Moody's Investors Service, Inc. The credit agreement requires the Company to comply with certain covenants, including that it maintains an interest coverage ratio as defined in the agreement. As of October 27, 2012, the Company was in compliance with all such required covenants, and the Company had not borrowed any funds under the credit facility. The Company may also, upon the agreement of either the then-existing lenders or additional lenders not currently parties to the agreement, increase the commitments under the credit facility by up to an additional $2.0 billion and/or extend the expiration date of the credit facility by up to two additional years, or up to February 17, 2019.

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Derivative Instruments	3 Months Ended
Oct. 27, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments (a) Summary of Derivative Instruments The Company uses derivative instruments primarily to manage exposures to foreign currency exchange rate, interest rate, and equity price risks. The Company's primary objective in holding derivatives is to reduce the volatility of earnings and cash flows associated with changes in foreign currency exchange rates, interest rates, and equity prices. The Company's derivatives expose it to credit risk to the extent that the counterparties may be unable to meet the terms of the agreement. The Company does, however, seek to mitigate such risks by limiting its counterparties to major financial institutions. In addition, the potential risk of loss with any one counterparty resulting from this type of credit risk is monitored. Management does not expect material losses as a result of defaults by counterparties. The fair values of the Company's derivative instruments and the line items on the Consolidated Balance Sheets to which they were recorded are summarized as follows (in millions):   DERIVATIVE ASSETS   DERIVATIVE LIABILITIES   Balance Sheet Line Item   October 27, 2012   July 28, 2012   Balance Sheet Line Item   October 27, 2012   July 28, 2012 Derivatives designated as hedging instruments:                       Foreign currency derivatives Other current assets   $ 47   $ 24   Other current liabilities   $ 8   $ 26 Equity derivatives Other current assets   11   —   Other current liabilities   15   4 Interest rate derivatives Other assets   205   223   Other long-term liabilities   —   — Total     263   247       23   30 Derivatives not designated as hedging instruments:                       Foreign currency derivatives Other current assets   10   16   Other current liabilities   32   12 Equity derivatives Other assets   1   1   Other long-term liabilities   —   — Total     11   17       32   12 Total     $ 274   $ 264       $ 55   $ 42 The effects of the Company's cash flow and net investment hedging instruments on OCI and the Consolidated Statements of Operations are summarized as follows (in millions): GAINS (LOSSES) RECOGNIZED IN OCI ON DERIVATIVES FOR THE THREE MONTHS ENDED (EFFECTIVE PORTION)   GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME FOR THE THREE MONTHS ENDED (EFFECTIVE PORTION) Derivatives designated as cash flow hedging instruments:   October 27, 2012   October 29, 2011   Line Item in Statements of Operations   October 27, 2012   October 29, 2011 Foreign currency derivatives   $ 66   $ (50 )   Operating expenses   $ (4 )   $ —             Cost of sales - service   (1 )   — Total   $ 66   $ (50 )       $ (5 )   $ —                       Derivatives designated as net investment hedging instruments:                     Foreign currency derivatives   $ (24 )   $ (4 )   Other income (loss), net   $ —   $ — During the three months ended October 27, 2012 and October 29, 2011, the amounts recognized in earnings on derivative instruments designated as cash flow hedges related to the ineffective portion were not material, and the Company did not exclude any component of the changes in fair value of the derivative instruments from the assessment of hedge effectiveness. As of October 27, 2012, the Company estimates that approximately $30 million of net derivative gains related to its cash flow hedges included in Accumulated Other Comprehensive Income ("AOCI") will be reclassified into earnings within the next 12 months. The effect on the Consolidated Statements of Operations of derivative instruments designated as fair value hedges and the underlying hedged items is summarized as follows (in millions):         GAINS (LOSSES) ON DERIVATIVES INSTRUMENTS FOR THE THREE MONTHS ENDED   GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE THREE MONTHS ENDED Derivatives Designated as Fair Value Hedging Instruments   Line Item in Statements of Operations   October 27, 2012   October 29, 2011   October 27, 2012   October 29, 2011 Equity derivatives   Other income (loss), net   $ (3 )   $ —   $ 3   $ — Interest rate derivatives   Interest expense   (18 )   35   18   (36 ) Total       $ (21 )   $ 35   $ 21   $ (36 ) The Company did not exclude from the assessment of hedge effectiveness any component of the changes in fair value of the derivative instruments designated as fair value hedges. The effect on the Consolidated Statements of Operations of derivative instruments not designated as hedges is summarized as follows (in millions):         GAINS (LOSSES) FOR THE THREE MONTHS ENDED Derivatives Not Designated as Hedging Instruments   Line Item in Statements of Operations   October 27, 2012   October 29, 2011 Foreign currency derivatives   Other income (loss), net   $ 53   $ (57 ) Total return swaps - deferred compensation   Operating expenses   14   (20 ) Equity derivatives   Other income (loss), net   9   7 Total       $ 76   $ (70 ) The notional amounts of the Company’s outstanding derivatives are summarized as follows (in millions):   October 27, 2012   July 28, 2012 Derivatives designated as hedging instruments:       Foreign currency derivatives - cash flow hedges $ 2,504   $ 2,910 Interest rate derivatives 4,250   4,250 Net investment hedging instruments 312   468 Equity derivatives 629   272 Derivatives not designated as hedging instruments:       Foreign currency derivatives 5,036   6,241 Total return swaps-deferred compensation 308   269 Total $ 13,039   $ 14,410 (b) Foreign Currency Exchange Risk The Company conducts business globally in numerous currencies. Therefore, it is exposed to adverse movements in foreign currency exchange rates. To limit the exposure related to foreign currency changes, the Company enters into foreign currency contracts. The Company does not enter into such contracts for trading purposes. The Company hedges forecasted foreign currency transactions related to certain operating expenses and service cost of sales with currency options and forward contracts. These currency option and forward contracts, designated as cash flow hedges, generally have maturities of less than 18 months. The Company assesses effectiveness based on changes in total fair value of the derivatives. The effective portion of the derivative instrument's gain or loss is initially reported as a component of AOCI and subsequently reclassified into earnings when the hedged exposure affects earnings. The ineffective portion, if any, of the gain or loss is reported in earnings immediately. During the periods presented, the Company did not discontinue any cash flow hedges for which it was probable that a forecasted transaction would not occur. The Company enters into foreign exchange forward and option contracts to reduce the short-term effects of foreign currency fluctuations on assets and liabilities such as foreign currency receivables, including long-term customer financings, investments, and payables. These derivatives are not designated as hedging instruments. Gains and losses on the contracts are included in other income (loss), net, and substantially offset foreign exchange gains and losses from the remeasurement of intercompany balances or other current assets, investments, or liabilities denominated in currencies other than the functional currency of the reporting entity. The Company hedges certain net investments in its foreign operations with forward contracts to reduce the effects of foreign currency fluctuations on the Company's net investment in those foreign subsidiaries. These derivative instruments generally have maturities of up to six months. (c) Interest Rate Risk Interest Rate Derivatives, Investments   The Company's primary objective for holding fixed income securities is to achieve an appropriate investment return consistent with preserving principal and managing risk. To realize these objectives, the Company may utilize interest rate swaps or other derivatives designated as fair value or cash flow hedges. As of October 27, 2012 and July 28, 2012, the Company did not have any outstanding interest rate derivatives related to its fixed income securities. Interest Rate Derivatives Designated as Fair Value Hedge, Long-Term Debt   In fiscal 2011, the Company entered into interest rate swaps designated as fair value hedges related to fixed-rate senior notes that were issued in March 2011 and are due in 2014 and 2017. In fiscal 2010, the Company entered into interest rate swaps designated as fair value hedges for a portion of senior fixed-rate notes that were issued in 2006 and are due in 2016. Under these interest rate swaps, the Company receives fixed-rate interest payments and makes interest payments based on LIBOR plus a fixed number of basis points. The effect of such swaps is to convert the fixed interest rates of the senior fixed-rate notes to floating interest rates based on LIBOR. The gains and losses related to changes in the fair value of the interest rate swaps are included in interest expense and substantially offset changes in the fair value of the hedged portion of the underlying debt that are attributable to the changes in market interest rates. The fair value of the interest rate swaps was reflected in other assets. (d) Equity Price Risk The Company may hold equity securities for strategic purposes or to diversify its overall investment portfolio. The publicly traded equity securities in the Company's portfolio are subject to price risk. To manage its exposure to changes in the fair value of certain equity securities, the Company may enter into equity derivatives that are designated as fair value hedges. The changes in the value of the hedging instruments are included in other income (loss), net, and offset the change in the fair value of the underlying hedged investment. In addition, the Company periodically manages the risk of its investment portfolio by entering into equity derivatives that are not designated as accounting hedges. The changes in the fair value of these derivatives are also included in other income (loss), net. The Company is also exposed to variability in compensation charges related to certain deferred compensation obligations to employees. Although not designated as accounting hedges, the Company utilizes derivatives such as total return swaps to economically hedge this exposure. (e) Credit-Risk-Related Contingent Features Certain derivative instruments are executed under agreements that have provisions requiring the Company and the counterparty to maintain a specified credit rating from certain credit rating agencies. If the Company's or the counterparty's credit-rating falls below a specified credit rating, either party has the right to request collateral on the derivatives' net liability position. Such provisions did not affect the Company's financial position as of October 27, 2012 and July 28, 2012.

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Commitments And Contingencies	3 Months Ended
Oct. 27, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	2. Commitments and Contingencies (a) Operating Leases The Company leases office space in many U.S. locations. Outside the United States, larger leased sites include sites in Australia, China, France, Germany, India, Israel, Italy, Japan, Norway, and the United Kingdom. The Company also leases equipment and vehicles. Future minimum lease payments under all noncancelable operating leases with an initial term in excess of one year as of October 27, 2012 are as follows (in millions): Fiscal Year Amount 2013 (remaining nine months) $ 270 2014 277 2015 225 2016 114 2017 81 Thereafter 215 Total $ 1,182 (b) Purchase Commitments with Contract Manufacturers and Suppliers The Company purchases components from a variety of suppliers and uses several contract manufacturers to provide manufacturing services for its products. During the normal course of business, in order to manage manufacturing lead times and help ensure adequate component supply, the Company enters into agreements with contract manufacturers and suppliers that either allow them to procure inventory based upon criteria as defined by the Company or establish the parameters defining the Company's requirements. A significant portion of the Company's reported purchase commitments arising from these agreements consists of firm, noncancelable, and unconditional commitments. In certain instances, these agreements allow the Company the option to cancel, reschedule, and adjust the Company's requirements based on its business needs prior to firm orders being placed. As of October 27, 2012 and July 28, 2012, the Company had total purchase commitments for inventory of $3,725 million and $3,869 million, respectively. The Company records a liability for firm, noncancelable, and unconditional purchase commitments for quantities in excess of its future demand forecasts consistent with the valuation of the Company's excess and obsolete inventory. As of October 27, 2012 and July 28, 2012, the liability for these purchase commitments was $171 million and $193 million, respectively, and was included in other current liabilities. (c) Other Commitments In connection with the Company's business combinations and asset purchases, the Company has agreed to pay certain additional amounts contingent upon the achievement of certain agreed-upon technology, development, product, or other milestones or the continued employment with the Company of certain employees of the acquired entities. The Company recognized such compensation expense of $12 million and $14 million during the three months ended October 27, 2012 and October 29, 2011, respectively. As of October 27, 2012, the Company estimated that future compensation expense and contingent consideration of up to $817 million may be required to be recognized pursuant to the applicable business combination and asset purchase agreements, which included a maximum potential $750 million in milestone payments (prior to a November 2012 amendment) related to Insieme as discussed in the next section below. The Company also has certain funding commitments, primarily related to its investments in privately held companies and venture funds, some of which are based on the achievement of certain agreed-upon milestones, and some of which are required to be funded on demand. The funding commitments were $124 million and $120 million as of October 27, 2012 and July 28, 2012, respectively. (d) Variable Interest Entities VCE Joint Venture VCE is a joint venture that the Company formed in fiscal 2010 with EMC Corporation ("EMC"), with investments from VMware, Inc. ("VMware") and Intel Corporation. VCE helps organizations leverage best-in-class technologies and disciplines from Cisco, EMC, and VMware to enable the transformation to cloud computing. As of October 27, 2012, the Company's cumulative gross investment in VCE was approximately $397 million, inclusive of accrued interest, and its ownership percentage was approximately 35%.  The Company accounts for its investment in VCE under the equity method, and its portion of VCE's net loss is recognized in other income (loss), net. The Company's consolidated share of VCE's losses, based upon its portion of the overall funding, was approximately 36.8%, for each of the three months ended October 27, 2012 and October 29, 2011. As of October 27, 2012, the Company has recorded cumulative losses from VCE of $281 million since inception, of which $42 million, and $31 million were recorded for the three months ended October 27, 2012 and October 29, 2011, respectively. The Company's carrying value in VCE as of October 27, 2012 was $116 million, and the balance was recorded in other assets. Over the next 12 months, as VCE scales its operations, the Company expects that it will make additional investments in VCE and may incur additional losses proportionate with the Company's share ownership. From time to time, EMC and Cisco may enter into guarantee agreements on behalf of VCE to indemnify third parties, such as customers, for monetary damages. Such guarantees were not material as of October 27, 2012. Insieme In the third quarter of fiscal 2012, the Company made an investment in Insieme, an early stage company focused on research and development in the data center market. As set forth in the agreement between the Company and Insieme, this investment includes $100 million of funding and a license to certain of the Company's technology. As a result of this initial investment, the Company owned approximately 86% of Insieme as of October 27, 2012 and has consolidated the results of Insieme in its Consolidated Financial Statements beginning as of the third quarter of fiscal 2012. Pursuant to a November 2012 amendment to the agreement between the Company and Insieme, the Company agreed to invest, upon the occurrence of certain events, an additional $35 million in Insieme, and as a result increased its ownership percentage to approximately 89%. The net loss attributable to the noncontrolling interests was not presented separately in the Consolidated Statements of Operations due to the amount being immaterial. In connection with this investment, the Company and Insieme have entered into a put/call option agreement that provides the Company with the right to purchase the remaining interests in Insieme. In addition, the noncontrolling interest holders can require the Company to purchase their shares upon the occurrence of certain events. If the Company acquires the remaining interests of Insieme, the noncontrolling interest holders are eligible to receive two milestone payments, which will be determined using agreed-upon formulas based on revenue for certain of Insieme's products. The Company will begin recognizing the amounts due under the milestone payments when it is determined that such payments are probable of being earned, which the Company expects may be in fiscal 2014. When such a determination is made, the milestone payments will then be recorded as compensation expense by the Company based on an estimate of the fair value of the amounts probable of being earned, pursuant to a vesting schedule. Subsequent changes to the fair value of the amounts probable of being earned and the continued vesting will result in adjustments to the recorded compensation expense. The maximum amount that could be recorded as compensation expense by the Company is approximately $863 million. This amount was increased from up to a previous maximum of $750 million, due to the November 2012 amendment, which contemplates higher staffing levels to perform additional product development. The milestone payments, if earned, are expected to be paid primarily during fiscal 2016 and fiscal 2017. Other Variable Interest Entities In the ordinary course of business, the Company has investments in other privately held companies and provides financing to certain customers. These other privately held companies and customers may be considered to be variable interest entities. The Company evaluates on an ongoing basis its investments in these other privately held companies and its customer financings and has determined that as of October 27, 2012 there were no other variable interest entities required to be consolidated in the Company's Consolidated Financial Statements. (e) Product Warranties and Guarantees The following table summarizes the activity related to product warranty liability during the three months ended October 27, 2012 and October 29, 2011 (in millions):   Three Months Ended   October 27, 2012   October 29, 2011 Balance at beginning of period $ 415   $ 342 Provision for warranties issued 162   151 Payments (155 )   (132 ) Balance at end of period $ 422   $ 361 The Company accrues for warranty costs as part of its cost of sales based on associated material product costs, labor costs for technical support staff, and associated overhead. The Company's products are generally covered by a warranty for periods ranging from 90 days to five years, and for some products the Company provides a limited lifetime warranty. In the normal course of business, the Company indemnifies other parties, including customers, lessors, and parties to other transactions with the Company, with respect to certain matters. The Company has agreed to hold the other parties harmless against losses arising from a breach of representations or covenants or out of intellectual property infringement or other claims made against certain parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. In addition, the Company has entered into indemnification agreements with its officers and directors, and the Company's Amended and Restated Bylaws contain similar indemnification obligations to the Company's agents. It is not possible to determine the maximum potential amount under these indemnification agreements due to the Company's limited history with prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under these agreements have not had a material effect on the Company's operating results, financial position, or cash flows. The Company also provides financing guarantees, which are generally for various third-party financing arrangements to channel partners and other end-user customers. See Note 7 to the Consolidated Financial Statements. The Company's other guarantee arrangements as of October 27, 2012 and July 28, 2012 that were subject to recognition and disclosure requirements were not material. (f) Legal Proceedings Brazilian authorities have investigated the Company's Brazilian subsidiary and certain of its current and former employees, as well as a Brazilian importer of the Company's products, and its affiliates and employees, relating to alleged evasion of import taxes and alleged improper transactions involving the subsidiary and the importer. Brazilian tax authorities have assessed claims against the Company's Brazilian subsidiary based on a theory of joint liability with the Brazilian importer for import taxes, interest, and penalties. In addition to claims asserted by the Brazilian federal tax authorities in prior fiscal years, tax authorities from the Brazilian state of Sao Paulo have asserted similar claims on the same legal basis in prior fiscal years. In the first quarter of fiscal 2013, the Brazilian federal tax authorities asserted an additional claim against the Company's Brazilian subsidiary based on a theory of joint liability with respect to an alleged underpayment of income taxes, social taxes, interest, and penalties by a Brazilian distributor. The asserted claims by Brazilian federal tax authorities are for calendar years 2003 through 2008, and the asserted claims by the tax authorities from the state of Sao Paulo, are for calendar years 2005 through 2007. The total asserted claims by Brazilian state and federal tax authorities aggregate to approximately $427 million for the alleged evasion of import and other taxes, approximately $1.1 billion for interest, and approximately $1.9 billion for various penalties, all determined using an exchange rate as of October 27, 2012. The Company has completed a thorough review of the matters and believes the asserted tax claims against the Company's Brazilian subsidiary are without merit, and the Company is defending the claims vigorously. While the Company believes there is no legal basis for the alleged liability, due to the complexities and uncertainty surrounding the judicial process in Brazil and the nature of the claims asserting joint liability with the importer, the Company is unable to determine the likelihood of an unfavorable outcome against its Brazilian subsidiary and is unable to reasonably estimate a range of loss, if any. The Company does not expect a final judicial determination for several years. On March 31, 2011 and April 12, 2011, purported shareholder class action lawsuits were filed in the United States District Court for the Northern District of California against the Company and certain of its officers and directors. The lawsuits have been consolidated, and an amended consolidated complaint was filed on December 2, 2011. The consolidated action is purportedly brought on behalf of purchasers of the Company's publicly traded securities between February 3, 2010 and May 11, 2011. Plaintiffs allege that defendants made false and misleading statements, purport to assert claims for violations of the federal securities laws, and seek unspecified compensatory damages and other relief. The Company believes the claims are without merit and intends to defend the actions vigorously. While the Company believes there is no legal basis for liability, due to the uncertainty surrounding the litigation process, the Company is unable to reasonably estimate a range of loss, if any, at this time. Beginning on April 8, 2011, a number of purported shareholder derivative lawsuits were filed in both the United States District Court for the Northern District of California and the California Superior Court for the County of Santa Clara against the Company's Board of Directors and several of its officers. The federal lawsuits have been consolidated in the Northern District of California. Plaintiffs in both the federal and state derivative actions allege that the Board allowed certain officers to make allegedly false and misleading statements. The complaint includes claims for violation of the federal securities laws, breach of fiduciary duties, waste of corporate assets, unjust enrichment, and violations of the California Corporations Code. The complaint seeks compensatory damages, disgorgement, and other relief. The Company is subject to patent claims asserted by VirnetX, Inc. on August 11, 2010 in the Federal District Court for the Eastern District of Texas.  VirnetX alleges that various Cisco products that implement a method for secure communication using virtual private networks infringe certain patents.  VirnetX seeks monetary damages.  The trial on these claims is scheduled to begin in March 2013.  The Company believes that it has strong arguments that its products do not use the technology described in the patents and that the patents are invalid.  If the jury were to find that Cisco's products infringe and find that the patents are not invalid, the Company believes that damages, as appropriately measured, would not be material given the limited contribution played by the alleged patented technology.  However, due to the uncertainty surrounding the litigation process, the Company is unable to reasonably estimate the ultimate outcome of this litigation at this time. In addition, the Company is subject to legal proceedings, claims, and litigation arising in the ordinary course of business, including intellectual property litigation. While the outcome of these matters is currently not determinable, the Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its consolidated financial position, results of operations, or cash flows.

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Shareholders' Equity	3 Months Ended
Oct. 27, 2012
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity (a) Stock Repurchase Program In September 2001, the Company's Board of Directors authorized a stock repurchase program. As of October 27, 2012, the Company's Board of Directors had authorized an aggregate repurchase of up to $82 billion of common stock under this program, and the remaining authorized repurchase amount was $5.6 billion with no termination date. A summary of the stock repurchase activity under the stock repurchase program, reported based on the trade date, is summarized as follows (in millions, except per-share amounts):   Shares Repurchased   Weighted- Average Price per Share   Amount Repurchased Cumulative balance at July 28, 2012 3,740   $ 20.36   $ 76,133 Repurchase of common stock under the stock repurchase program 15   16.44   253 Cumulative balance at October 27, 2012 3,755   $ 20.34   $ 76,386 The purchase price for the shares of the Company's stock repurchased is reflected as a reduction to shareholders' equity. The Company is required to allocate the purchase price of the repurchased shares as (i) a reduction to retained earnings and (ii) a reduction of common stock and additional paid-in capital. Issuance of common stock and the tax benefit related to employee stock incentive plans are recorded as an increase to common stock and additional paid-in capital. (b) Cash Dividends on Shares of Common Stock During the three months ended October 27, 2012, the Company paid cash dividends of $0.14 per common share, or $744 million, on the Company's outstanding common stock. During the three months ended October 29, 2011, the Company paid cash dividends of $0.06 per common share, or $322 million, on the Company's outstanding common stock. On November 15, 2012, the Company's Board of Directors declared a quarterly dividend of $0.14 per common share to be paid on December 19, 2012 to all shareholders of record as of the close of business on November 29, 2012. Any future dividends will be subject to the approval of the Company's Board of Directors. (c) Other Repurchases of Common Stock For the three months ended October 27, 2012 and October 29, 2011, the Company repurchased approximately 11 million and 9 million shares, or $203 million and $137 million, of common stock, respectively, in settlement of employee tax withholding obligations due upon the vesting of restricted stock or stock units. (d) Accumulated Other Comprehensive Income The components of AOCI, net of tax, and the other comprehensive income (loss), excluding noncontrolling interest, for the three months ended October 27, 2012 and October 29, 2011 are summarized as follows (in millions):   Net Unrealized Gains on Investments   Net Unrealized Gains (Losses) Cash Flow Hedging Instruments   Cumulative Translation Adjustment and Other   Accumulated Other Comprehensive Income BALANCE AT JULY 28, 2012 $ 409   $ (53 )   $ 305   $ 661 Other comprehensive income (loss) attributable to Cisco Systems, Inc. (13 )   71   114   172 BALANCE AT OCTOBER 27, 2012 $ 396   $ 18   $ 419   $ 833                   Net Unrealized Gains on Investments   Net Unrealized Gains (Losses) Cash Flow Hedging Instruments   Cumulative Translation Adjustment and Other   Accumulated Other Comprehensive Income BALANCE AT JULY 30, 2011 $ 487   $ 6   $ 801   $ 1,294 Other comprehensive loss attributable to Cisco Systems, Inc. (52 )   (50 )   (211 )   (313 ) BALANCE AT OCTOBER 29, 2011 $ 435   $ (44 )   $ 590   $ 981

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Employee Benefit Plans	3 Months Ended
Oct. 27, 2012
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Employee Benefit Plans	Employee Benefit Plans (a) Employee Stock Incentive Plans Stock Incentive Plan Program Description   As of October 27, 2012, the Company had five stock incentive plans: the 2005 Stock Incentive Plan (the "2005 Plan"); the 1996 Stock Incentive Plan (the "1996 Plan"); the 1997 Supplemental Stock Incentive Plan (the "Supplemental Plan"); the Cisco Systems, Inc. SA Acquisition Long-Term Incentive Plan (the "SA Acquisition Plan"); and the Cisco Systems, Inc. WebEx Acquisition Long-Term Incentive Plan (the "WebEx Acquisition Plan"). In addition, the Company has, in connection with the acquisitions of various companies, assumed the share-based awards granted under stock incentive plans of the acquired companies or issued share-based awards in replacement thereof. Share-based awards are designed to reward employees for their long-term contributions to the Company and provide incentives for them to remain with the Company. The number and frequency of share-based awards are based on competitive practices, operating results of the Company, government regulations, and other factors. Since the inception of the stock incentive plans, the Company has granted share-based awards to a significant percentage of its employees, and the majority has been granted to employees below the vice president level. The Company's primary stock incentive plans are summarized as follows: 2005 Plan    As amended on November 15, 2007, the maximum number of shares issuable under the 2005 Plan over its term is 559 million shares plus the amount of any shares underlying awards outstanding on November 15, 2007 under the 1996 Plan, the SA Acquisition Plan, and the WebEx Acquisition Plan that are forfeited or are terminated for any other reason before being exercised or settled. If any awards granted under the 2005 Plan are forfeited or are terminated for any other reason before being exercised or settled, then the shares underlying the awards will again be available under the 2005 Plan. Pursuant to an amendment approved by the Company's shareholders on November 12, 2009, the number of shares available for issuance under the 2005 Plan was reduced by 1.5 shares for each share awarded as a stock grant or a stock unit, and any shares underlying awards outstanding under the 1996 Plan, the SA Acquisition Plan, and the WebEx Acquisition Plan that expire unexercised at the end of their maximum terms become available for reissuance under the 2005 Plan. The 2005 Plan permits the granting of stock options, restricted stock, restricted stock units ("RSUs"), the vesting of which may be performance-based or market-based along with the requisite service requirement, and stock appreciation rights to employees (including employee directors and officers), consultants of the Company and its subsidiaries and affiliates, and non-employee directors of the Company. Stock options and stock appreciation rights granted under the 2005 Plan have an exercise price of at least 100% of the fair market value of the underlying stock on the grant date and prior to November 12, 2009 have an expiration date no later than nine years from the grant date. The expiration date for stock options and stock appreciation rights granted subsequent to the amendment approved on November 12, 2009 shall be no later than ten years from the grant date. The stock options will generally become exercisable for 20% or 25% of the option shares one year from the date of grant and then ratably over the following 48 or 36 months, respectively. Time-based stock grants and time-based RSUs will generally vest with respect to 20% or 25% of the shares or share units covered by the grant on each of the first through fifth or fourth anniversaries of the date of the grant, respectively. Performance-based and market-based RSUs typically vest at the end of the three year requisite service period or earlier if the award recipient meets certain retirement eligibility conditions. The Compensation and Management Development Committee of the Board of Directors has the discretion to use different vesting schedules. Stock appreciation rights may be awarded in combination with stock options or stock grants, and such awards shall provide that the stock appreciation rights will not be exercisable unless the related stock options or stock grants are forfeited. Stock grants may be awarded in combination with non-statutory stock options, and such awards may provide that the stock grants will be forfeited in the event that the related non-statutory stock options are exercised. 1996 Plan  The 1996 Plan expired on December 31, 2006, and the Company can no longer make equity awards under the 1996 Plan. The maximum number of shares issuable over the term of the 1996 Plan was 2.5 billion shares. Stock options granted under the 1996 Plan have an exercise price of at least 100% of the fair market value of the underlying stock on the grant date and expire no later than nine years from the grant date. The stock options generally become exercisable for 20% or 25% of the option shares one year from the date of grant and then ratably over the following 48 or 36 months, respectively. Certain other grants have utilized a 60-month ratable vesting schedule. In addition, the Board of Directors, or other committees administering the 1996 Plan, have the discretion to use a different vesting schedule and have done so from time to time. Supplemental Plan The Supplemental Plan expired on December 31, 2007, and the Company can no longer make equity awards under the Supplemental Plan. Officers and members of the Company's Board of Directors were not eligible to participate in the Supplemental Plan. Nine million shares were reserved for issuance under the Supplemental Plan. Acquisition Plans In connection with the Company's acquisitions of Scientific-Atlanta, Inc. ("Scientific-Atlanta") and WebEx Communications, Inc. ("WebEx"), the Company adopted the SA Acquisition Plan and the WebEx Acquisition Plan, respectively, each effective upon completion of the applicable acquisition. These plans constitute assumptions, amendments, restatements, and renamings of the 2003 Long-Term Incentive Plan of Scientific-Atlanta and the WebEx Communications, Inc. Amended and Restated 2000 Stock Incentive Plan, respectively. The plans permit the grant of stock options, stock, stock units, and stock appreciation rights to certain employees of the Company and its subsidiaries and affiliates who had been employed by Scientific-Atlanta or its subsidiaries or WebEx or its subsidiaries, as applicable. As a result of the shareholder approval of the amendment and extension of the 2005 Plan, as of November 15, 2007, the Company will no longer make stock option grants or direct share issuances under either the SA Acquisition Plan or the WebEx Acquisition Plan. (b) Employee Stock Purchase Plan The Company has an Employee Stock Purchase Plan, which includes its subplan, the International Employee Stock Purchase Plan (together, the "Purchase Plan"), under which 471.4 million shares of the Company's common stock have been reserved for issuance as of October 27, 2012. Eligible employees are offered shares through a 24-month offering period, which consists of four consecutive 6-month purchase periods. Employees may purchase a limited number of shares of the Company's stock at a discount of up to 15% of the lesser of the market value at the beginning of the offering period or the end of each 6-month purchase period. The Purchase Plan is scheduled to terminate on January 3, 2020. No shares were issued under the Purchase Plan during each of the three months ended October 27, 2012 and October 29, 2011. As of October 27, 2012, 87 million shares were available for issuance under the Purchase Plan. (c) Summary of Share-Based Compensation Expense Share-based compensation expense consists primarily of expenses for stock options, stock purchase rights, restricted stock, and restricted stock units granted to employees. The following table summarizes share-based compensation expense (in millions):   Three Months Ended   October 27, 2012   October 29, 2011 Cost of sales - product $ 10   $ 13 Cost of sales - service 35   37 Share-based compensation expense in cost of sales 45   50 Research and development 84   101 Sales and marketing 130   142 General and administrative 50   48 Restructuring and other charges (3 )   — Share-based compensation expense in operating expenses 261   291 Total share-based compensation expense $ 306   $ 341 As of October 27, 2012, the total compensation cost related to unvested share-based awards not yet recognized was $1.9 billion, which is expected to be recognized over approximately 2.3 years on a weighted-average basis. The income tax benefit for share-based compensation expense was $79 million and $90 million for the three months ended October 27, 2012 and October 29, 2011, respectively. The Company uses third-party analyses to assist in developing the assumptions used in, as well as calibrating, its lattice-binomial and Black-Scholes models. The Company is responsible for determining the assumptions used in estimating the fair value of its share-based payment awards. The Company used the implied volatility for traded options (with contract terms corresponding to the expected life of the employee stock purchase rights) on the Company's stock as the expected volatility assumption required in the Black-Scholes model. The implied volatility is more representative of future stock price trends than historical volatility. The risk-free interest rate assumption is based upon observed interest rates appropriate for the term of the Company's employee stock purchase rights. The dividend yield assumption is based on the history and expectation of dividend payouts at the grant date. The use of the lattice-binomial model requires extensive actual employee exercise behavior data for the relative probability estimation purpose, and a number of complex assumptions as presented in the preceding table. The estimated kurtosis and skewness are technical measures of the distribution of stock price returns, which affect expected employee stock option exercise behaviors, and are based on the Company's stock price return history as well as consideration of various academic analyses. The expected life of employee stock options is a derived output of the lattice-binomial model, which represents the weighted-average period the stock options are expected to remain outstanding. (d) Share-Based Awards Available for Grant A summary of share-based awards available for grant is as follows (in millions):   Share-Based Awards Available for Grant BALANCE AT JULY 30, 2011 255 Restricted stock, stock units, and other share-based awards granted (95 ) Share-based awards canceled/forfeited/expired 64 Other (6 ) BALANCE AT JULY 28, 2012 218 Restricted stock, stock units, and other share-based awards granted (23 ) Share-based awards canceled/forfeited/expired 74 Other (3 ) BALANCE AT OCTOBER 27, 2012 266 As reflected in the preceding table, for each share awarded as restricted stock or subject to a restricted stock unit award under the 2005 Plan, an equivalent of 1.5 shares was deducted from the available share-based award balance. For restricted stock units that were awarded with vesting contingent upon the achievement of future financial performance or market-based metrics, the maximum awards that can be achieved upon full vesting of such awards were reflected in the preceding table. (e) Restricted Stock and Stock Unit Awards A summary of the restricted stock and stock unit activity, which includes time-based and performance-based or market-based restricted stock, is as follows (in millions, except per-share amounts):   Restricted Stock/ Stock Units   Weighted-Average Grant Date Fair Value per Share   Aggregated Fair Market Value UNVESTED BALANCE AT JULY 30, 2011 116   $ 21.50     Granted and assumed 65   17.45     Vested (35 )   21.94   $ 580 Canceled/forfeited (18 )   20.38     UNVESTED BALANCE AT JULY 28, 2012 128   19.46     Granted and assumed 15   18.03     Vested (31 )   21.08   $ 593 Canceled/forfeited (3 )   19.62     UNVESTED BALANCE AT OCTOBER 27, 2012 109   $ 18.80     The valuation of time-based RSUs and the underlying assumptions being used are summarized as follows:   RESTRICTED STOCK UNITS Three Months Ended October 27, 2012   October 29, 2011 Number of shares granted (in millions) 11   11 Weighted-average assumptions/inputs:          Grant date fair value per share $ 17.65   $ 15.69    Expected dividend yield 2.9 %   1.5 % In addition to the time-based RSUs in the preceding table, the Company granted approximately 4 million performance-based stock unit awards ("PRSUs") for the three months ended October 27, 2012 and approximately 1 million such awards for the three months ended October 29, 2011. These PRSUs are contingent on the achievement of the Company's financial performance metrics or its comparative market-based returns. On the date of grant, the Company estimated the fair value of restricted stock units with market-based conditions using a Monte Carlo simulation model. The Company used the assumptions in the preceding table to determine the grant date fair value of restricted stock units with performance metrics conditions. (f) Stock Option Awards A summary of the stock option activity is as follows (in millions, except per-share amounts):   STOCK OPTIONS OUTSTANDING   Number Outstanding   Weighted-Average Exercise Price per Share BALANCE AT JULY 30, 2011 621   $ 21.79 Assumed from acquisitions 1   2.08 Exercised (66 )   13.51 Canceled/forfeited/expired (36 )   23.40 BALANCE AT JULY 28, 2012 520   22.68 Exercised (8 )   14.21 Canceled/forfeited/expired (70 )   20.73 BALANCE AT OCTOBER 27, 2012 442   $ 23.15 The following table summarizes significant ranges of outstanding and exercisable stock options as of October 27, 2012 (in millions, except years and share prices):   STOCK OPTIONS OUTSTANDING   STOCK OPTIONS EXERCISABLE Range of Exercise Prices Number Outstanding   Weighted- Average Remaining Contractual Life (in Years)   Weighted- Average Exercise Price per Share   Aggregate Intrinsic Value   Number Exercisable   Weighted- Average Exercise Price per Share   Aggregate Intrinsic Value $  0.01 – 15.00 8   3.80   $ 7.57   $ 78   7   $ 7.88   $ 70 15.01 – 18.00 76   1.90   17.79   2   76   17.79   2 18.01 – 20.00 95   1.10   19.17   —   95   19.17   — 20.01 – 25.00 135   2.66   22.78   —   134   22.78   — 25.01 – 35.00 128   3.84   30.66   —   126   30.70   — Total 442   2.55   $ 23.15   $ 80   438   $ 23.17   $ 72 The aggregate intrinsic value in the preceding table represents the total pretax intrinsic value, based on the Company's closing stock price of $17.29 as of October 26, 2012, which would have been received by the option holders had those option holders exercised their stock options as of that date. The total number of in-the-money stock options exercisable as of October 27, 2012 was 9 million. As of July 28, 2012, 512 million outstanding stock options were exercisable and the weighted-average exercise price was $22.65.

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Income Taxes	3 Months Ended
Oct. 27, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The following table provides details of income taxes (in millions, except percentages):   Three Months Ended   October 27, 2012   October 29, 2011 Income before provision for income taxes $ 2,631   $ 2,245 Provision for income taxes $ 539   $ 468 Effective tax rate 20.5 %   20.8 % As of October 27, 2012, the Company had $2.9 billion of unrecognized tax benefits, of which $2.5 billion, if recognized, would favorably impact the effective tax rate. The Company regularly engages in discussions and negotiations with tax authorities regarding tax matters in various jurisdictions. The Company believes it is reasonably possible that certain federal, foreign, and state tax matters may be concluded in the next 12 months. Specific positions that may be resolved include issues involving transfer pricing and various other matters. The Company estimates that it is reasonably possible that the unrecognized tax benefits at October 27, 2012 could be reduced in the next 12 months by approximately $1.1 billion, of which approximately $0.9 billion could increase earnings.

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Segment Information And Major Customers	3 Months Ended
Oct. 27, 2012
Segment Reporting [Abstract]
Segment Information and Major Customers	16. Segment Information and Major Customers (a)  Net Sales and Gross Margin by Segment The Company conducts business globally and is primarily managed on a geographic basis consisting of three segments: the Americas; EMEA; and APJC. The Company's management makes financial decisions and allocates resources based on the information it receives from its internal management system. Sales are attributed to a segment based on the ordering location of the customer. The Company does not allocate research and development, sales and marketing, or general and administrative expenses to its segments in this internal management system because management does not include the information in its measurement of the performance of the operating segments. In addition, the Company does not allocate amortization and impairment of acquisition-related intangible assets, share-based compensation expense, impacts to cost of sales from purchase accounting adjustments to inventory, charges related to asset impairments and restructurings, and certain other charges to the gross margin for each segment because management does not include this information in its measurement of the performance of the operating segments. Summarized financial information by segment for the three months ended October 27, 2012 and October 29, 2011, based on the Company's internal management system and as utilized by the Company's Chief Operating Decision Maker ("CODM"), is as follows (in millions):   Three Months Ended   October 27, 2012 October 29, 2011 Net sales:       Americas $ 7,023   $ 6,588 EMEA 2,841   2,845 APJC 2,012   1,823 Total $ 11,876   $ 11,256 Gross margin:       Americas 4,468   4,160 EMEA 1,798   1,754 APJC 1,176   1,108 Segment total 7,442   7,022 Unallocated corporate items (203 )   (132 ) Total $ 7,239   $ 6,890 Net sales in the United States, which is included in the Americas, were $6.1 billion and $5.6 billion for the three months ended October 27, 2012 and October 29, 2011, respectively. (b) Net Sales for Groups of Similar Products and Services The Company designs, manufactures, and sells Internet Protocol ("IP")-based networking and other products related to the communications and IT industry and provides services associated with these products and their use. The Company groups its products and technologies into the following categories: Switching, NGN Routing, Service Provider Video, Collaboration, Wireless, Data Center, Security, and Other Products. These products, primarily integrated by Cisco IOS Software, link geographically dispersed local-area networks ("LANs"), metropolitan-area networks ("MANs"), and wide-area networks ("WANs"). The Company has reclassified the prior periods to conform to the current period's presentation. The following table presents net sales for groups of similar products and services (in millions):   Three Months Ended   October 27, 2012     October 29, 2011 Net sales:         Switching $ 3,616     $ 3,687 NGN Routing 2,052     2,094 Service Provider Video 1,148     883 Collaboration 1,020     1,108 Wireless 486     353 Data Center 417     259 Security 338     319 Other 220     249 Product 9,297     8,952 Service 2,579     2,304 Total $ 11,876     $ 11,256 (c) Additional Segment Information The majority of the Company's assets, excluding cash and cash equivalents and investments, as of October 27, 2012 and July 28, 2012 were attributable to its U.S. operations. The Company's total cash and cash equivalents and investments held by various foreign subsidiaries were $37.5 billion and $42.5 billion as of October 27, 2012 and July 28, 2012, respectively, and the remaining $7.5 billion and $6.2 billion at the respective period ends was available in the United States. Property and equipment information is based on the physical location of the assets. The following table presents property and equipment information for geographic areas (in millions):   October 27, 2012   July 28, 2012 Property and equipment, net:       United States $ 2,801   $ 2,842 International 608   560 Total $ 3,409   $ 3,402

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Net Income Per Share	3 Months Ended
Oct. 27, 2012
Earnings Per Share [Abstract]
Net Income Per Share	Net Income per Share The following table presents the calculation of basic and diluted net income per share (in millions, except per-share amounts):   Three Months Ended   October 27, 2012   October 29, 2011 Net income $ 2,092   $ 1,777 Weighted-average shares - basic 5,301   5,394 Effect of dilutive potential common shares 33   13 Weighted-average shares - diluted 5,334   5,407 Net income per share - basic $ 0.39   $ 0.33 Net income per share - diluted $ 0.39   $ 0.33 Antidilutive employee share-based awards, excluded 438   679 Employee equity share options, unvested shares, and similar equity instruments granted by the Company are treated as potential common shares outstanding in computing diluted earnings per share. Diluted shares outstanding include the dilutive effect of in-the-money options, unvested restricted stock, and restricted stock units. The dilutive effect of such equity awards is calculated based on the average share price for each fiscal period using the treasury stock method. Under the treasury stock method, the amount the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of tax benefits that would be recorded in additional paid-in capital when the award becomes deductible are collectively assumed to be used to repurchase shares.

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Supplemental Information (Tables)	3 Months Ended
Oct. 27, 2012
Stockholders' Equity Note [Abstract]
Stock Repurchases Since Inception Of Program [Table Text Block]	The stock repurchases since the inception of this program and the related impacts on Cisco shareholders’ equity are summarized in the following table (in millions):     Shares of Common Stock   Common Stock and Additional Paid-In Capital   Retained Earnings   Total Cisco Shareholders’ Equity Repurchases of common stock under the repurchase program 3,755   $ 17,155   $ 59,231   $ 76,386

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Summary of Significant Accounting Policies	3 Months Ended
Oct. 27, 2012
Summary of Significant Accounting Policies [Abstract]
Accounting Changes and Error Corrections [Text Block]	(a) New Accounting Updates Recently Adopted In June 2011, the FASB issued an accounting standard update to provide guidance on increasing the prominence of items reported in other comprehensive income, which eliminated the option to present components of other comprehensive income as part of the statement of equity. The Company adopted this accounting standard in the first quarter of fiscal 2013. In August 2011, the FASB approved a revised accounting standard update intended to simplify how an entity tests goodwill for impairment. The amendment will allow an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity no longer will be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013, and its adoption did not have any impact on the Company's Consolidated Financial Statements.
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	(b) Recent Accounting Standards or Updates Not Yet Effective In December 2011, the FASB issued an accounting standard update requiring enhanced disclosures about certain financial instruments and derivative instruments that are offset in the statement of financial position or that are subject to enforceable master netting arrangements or similar agreements. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2014, at which time the Company will include the required disclosures. In July 2012, the FASB issued an accounting standard update intended to simplify how an entity tests indefinite-lived intangible assets other than goodwill for impairment by providing entities with an option to perform a qualitative assessment to determine whether further impairment testing is necessary. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2014, and early adoption is permitted. The adoption of this accounting standard update is not expected to have a material impact on the Company's Consolidated Financial Statements.

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Business Combinations (Tables)	3 Months Ended
Oct. 27, 2012
Business Combinations [Abstract]
Schedule of Purchase Price Allocation [Table Text Block]	The following table summarizes the purchase consideration for the NDS acquisition (in millions):     Fair Value Cash consideration to seller   $ 4,012 Repayment of NDS debt to third party creditors   993 Total purchase consideration   $ 5,005
Purchase Consideration Summary (NDS) [Table Text Block]	A summary of the preliminary allocation of the total purchase consideration for NDS is presented as follows (in millions):     Fair Value Cash and cash equivalents   $ 98 Accounts receivable, net   199 Other tangible assets   268 Goodwill   3,444 Purchased intangible assets   1,746 Deferred tax liabilities, net   (378 ) Liabilities assumed   (372 ) Total purchase consideration   $ 5,005
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The Company completed three additional business combinations during the three months ended October 27, 2012 for a total cash consideration of $5 million. A summary of the allocation of the total purchase consideration is presented as follows (in millions):   Purchase Consideration   Net Liabilities Assumed   Purchased Intangible Assets   Goodwill All other acquisitions $ 5   $ (3 )   $ 7   $ 1

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Goodwill And Purchased Intangible Assets (Tables)	3 Months Ended
Oct. 27, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill By Reportable Segment	The following table presents the goodwill allocated to the Company's reportable segments as of and during the three months ended October 27, 2012 (in millions):     Balance at July 28, 2012   Acquisition of NDS   All Other Acquisitions   Balance at October 27, 2012 Americas   $ 11,755   $ 1,230   $ 1   $ 12,986 EMEA   3,287   1,327   —   4,614 APJC   1,956   887   —   2,843 Total   $ 16,998   $ 3,444   $ 1   $ 20,443
Schedule Of Intangible Assets Acquired As Part Of Business Combination [Text Block]	The following table presents details of the Company's intangible assets acquired through business combinations completed during the three months ended October 27, 2012 (in millions, except years):   FINITE LIVES   INDEFINITE LIVES   TOTAL   TECHNOLOGY   CUSTOMER RELATIONSHIPS   OTHER   IPR&D     Weighted- Average Useful Life (in Years)   Amount   Weighted- Average Useful Life (in Years)   Amount   Weighted- Average Useful Life (in Years)   Amount   Amount   Amount NDS Group Limited 6.4   $ 807   6.7   $ 818   7.4   $ 27   $ 94   $ 1,746 All other acquisitions 3.0   7   —   —   —   —   —   7 Total     $ 814       $ 818       $ 27   $ 94   $ 1,753
Schedule Of Purchased Intangible Assets	The following tables present details of the Company’s purchased intangible assets (in millions):  October 27, 2012   Gross   Accumulated Amortization   Net Purchased intangible assets with finite lives:             Technology   $ 3,053   $ (1,027 )   $ 2,026 Customer relationships   3,079   (1,780 )   1,299 Other   73   (43 )   30 Total purchased intangible assets with finite lives   6,205   (2,850 )   3,355 In-process research and development, with indefinite lives   94   —   94 Total   $ 6,299   $ (2,850 )   $ 3,449 July 28, 2012   Gross   Accumulated Amortization   Net Purchased intangible assets with finite lives:             Technology   $ 2,267   $ (908 )   $ 1,359 Customer relationships   2,261   (1,669 )   592 Other   49   (41 )   8 Total   $ 4,577   $ (2,618 )   $ 1,959
Schedule Of Amortization Of Purchased Intangible Assets	The following table presents the amortization of purchased intangible assets (in millions):     Three Months Ended     October 27, 2012   October 29, 2011 Amortization of purchased intangible assets:         Cost of sales   $ 143   $ 96 Operating expenses   122   99 Total   $ 265   $ 195
Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets	The estimated future amortization expense of purchased intangible assets with finite lives as of October 27, 2012 is as follows (in millions): Fiscal Year   Amount 2013 (remaining nine months)   $ 702 2014   785 2015   701 2016   474 2017   325 Thereafter   368 Total   $ 3,355

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Restructuring And Other Charges (Tables)	3 Months Ended
Oct. 27, 2012
Restructuring Charges [Abstract]
Schedule of Restructuring and Related Costs	The following table summarizes the activities related to the restructuring and other charges pursuant to the Company's July 2011 announcement related to the realignment and restructuring of the Company's business as well as certain consumer product lines as announced during April 2011 (in millions):     Voluntary Early Retirement Program   Employee Severance   Goodwill and Intangible Assets   Other   Total Gross charges in fiscal 2011   $ 453   $ 247   $ 71   $ 28   $ 799 Cash payments   (436 )   (13 )   —   —   (449 ) Non-cash items   —   —   (71 )   (17 )   (88 ) BALANCE AT JULY 30, 2011   $ 17   $ 234   $ —   $ 11   $ 262 Gross charges in fiscal 2012   —   299   —   54   353 Change in estimate related to fiscal 2011 charges   —   (49 )   —   —   (49 ) Cash payments   (17 )   (401 )   —   (18 )   (436 ) Non-cash items   —   —   —   (20 )   (20 ) BALANCE AT JULY 28, 2012   $ —   $ 83 $ — $ 27 $ 110 Charges in fiscal 2013   —   65   —   (6 )   59 Cash payments   —   (89 )   —   (7 )   (96 ) Non-cash items   —   —   —   (1 )   (1 ) BALANCE AT OCTOBER 27, 2012   $ —   $ 59   $ —   $ 13   $ 72

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Balance Sheet Details (Tables)	3 Months Ended
Oct. 27, 2012
Balance Sheet Details [Abstract]
Balance Sheet Details	The following tables provide details of selected balance sheet items (in millions):     October 27, 2012   July 28, 2012 Inventories:         Raw materials   $ 101   $ 127 Work in process   36   35 Finished goods:         Distributor inventory and deferred cost of sales   671   630 Manufactured finished goods   615   597 Total finished goods   1,286   1,227 Service-related spares   237   213 Demonstration systems   49   61           Total   $ 1,709   $ 1,663           Property and equipment, net:         Land, buildings, and building and leasehold improvements   $ 4,458   $ 4,363 Computer equipment and related software   1,491   1,469 Production, engineering, and other equipment   5,495   5,364 Operating lease assets (1)   312   300 Furniture and fixtures   494   487     12,250   11,983 Less accumulated depreciation and amortization (1)   (8,841 )   (8,581 ) Total   $ 3,409   $ 3,402           (1)      Accumulated depreciation related to operating lease assets was $192 and $181 as of October 27, 2012 and July 28, 2012, respectively.            Other assets:         Deferred tax assets   $ 2,061   $ 2,270 Investments in privately held companies   830   858 Other   849   754 Total   $ 3,740   $ 3,882           Deferred revenue:         Service   $ 8,753   $ 9,173 Product:         Unrecognized revenue on product shipments and other deferred revenue   3,074   2,975 Cash receipts related to unrecognized revenue from two-tier distributors   796   732 Total product deferred revenue   3,870   3,707 Total   $ 12,623   $ 12,880 Reported as:         Current   $ 8,721   $ 8,852 Noncurrent   3,902   4,028 Total   $ 12,623   $ 12,880

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Financing Receivables And Guarantees (Tables)	3 Months Ended
Oct. 27, 2012
Financing Receivables And Guarantees [Abstract]
Financing Receivables	A summary of the Company’s financing receivables is presented as follows (in millions): October 27, 2012 Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Financing Receivables Gross $ 3,601   $ 1,816   $ 2,639   $ 8,056 Unearned income (261 )   —   —   (261 ) Allowance for credit loss (248 )   (114 )   (12 )   (374 ) Total, net $ 3,092   $ 1,702   $ 2,627   $ 7,421 Reported as:               Current $ 1,310   $ 947   $ 1,469   $ 3,726 Noncurrent 1,782   755   1,158   3,695 Total, net $ 3,092   $ 1,702   $ 2,627   $ 7,421 July 28, 2012 Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Financing Receivables Gross $ 3,429   $ 1,796   $ 2,651   $ 7,876 Unearned income (250 )   —   —   (250 ) Allowance for credit loss (247 )   (122 )   (11 )   (380 ) Total, net $ 2,932   $ 1,674   $ 2,640   $ 7,246 Reported as:               Current 1,200   968   1,493   3,661 Noncurrent 1,732   706   1,147   3,585 Total, net $ 2,932   $ 1,674   $ 2,640   $ 7,246
Contractual Maturities Of The Gross Lease Receivables	Contractual maturities of the gross lease receivables at October 27, 2012 are summarized as follows (in millions): Fiscal Year   Amount 2013 (remaining nine months)   $ 1,199 2014   1,205 2015   732 2016   342 2017   123 Total   $ 3,601
Schedule Of Internal Credit Risk Rating For Each Portfolio Segment And Class	Financing receivables categorized by the Company's internal credit risk rating as of October 27, 2012 and July 28, 2012 are summarized as follows (in millions):   INTERNAL CREDIT RISK RATING             October 27, 2012 1 to 4   5 to 6   7 and Higher   Total   Residual Value   Gross Receivables, Net of Unearned Income Lease receivables $ 1,602   $ 1,417   $ 42   $ 3,061   $ 279   $ 3,340 Loan receivables 945   834   37   1,816   —   1,816 Financed service contracts and other 1,531   1,010   98   2,639   —   2,639 Total $ 4,078   $ 3,261   $ 177   $ 7,516   $ 279   $ 7,795   INTERNAL CREDIT RISK RATING             July 28, 2012 1 to 4   5 to 6   7 and  Higher   Total   Residual Value   Gross Receivables, Net of Unearned Income Lease receivables $ 1,532   $ 1,342   $ 31   $ 2,905   $ 274   $ 3,179 Loan receivables 831   921   44   1,796   —   1,796 Financed service contracts and other 1,552   1,030   69   2,651   —   2,651 Total $ 3,915   $ 3,293   $ 144   $ 7,352   $ 274   $ 7,626
Schedule Of Financing Receivables By Portfolio Segment And Class Aging Analysis	The following tables present the aging analysis of financing receivables as of October 27, 2012 and July 28, 2012 (in millions):   DAYS PAST DUE (INCLUDES BILLED AND UNBILLED)                 October 27, 2012 31-60   61-90    91+   Total Past Due   Current   Gross Receivables, Net of Unearned Income   Non-Accrual Financing Receivables   Impaired Financing Receivables Lease receivables $ 88   $ 76   $ 206   $ 370   $ 2,970   $ 3,340   $ 23   $ 15 Loan receivables 6   —   23   29   1,787   1,816   6   6 Financed service contracts and other 64   130   477   671   1,968   2,639   16   7 Total $ 158   $ 206   $ 706   $ 1,070   $ 6,725   $ 7,795   $ 45   $ 28   DAYS PAST DUE (INCLUDES BILLED AND UNBILLED)                 July 28, 2012 31-60   61-90    91+   Total Past Due   Current   Gross Receivables, Net of Unearned Income   Non-Accrual Financing Receivables   Impaired Financing Receivables Lease receivables $ 151   $ 69   $ 173   $ 393   $ 2,786   $ 3,179   $ 23   $ 14 Loan receivables 10   8   11   29   1,767   1,796   4   4 Financed service contracts and other 89   68   392   549   2,102   2,651   18   10 Total $ 250   $ 145   $ 576   $ 971   $ 6,655   $ 7,626   $ 45   $ 28
Allowance For Credit Loss And Related Financing Receivables	The allowances for credit loss and the related financing receivables are summarized as follows (in millions):   CREDIT LOSS ALLOWANCES   Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Allowance for credit loss as of July 28, 2012 $ 247   $ 122   $ 11   $ 380 Provisions, net (2 )   (10 )   1   (11 ) Foreign exchange and other 3   2   —   5 Allowance for credit loss as of October 27, 2012 $ 248   $ 114   $ 12   $ 374 Gross receivables as of October 27, 2012, net of unearned income $ 3,340   $ 1,816   $ 2,639   $ 7,795   CREDIT LOSS ALLOWANCES   Lease Receivables   Loan Receivables   Financed Service Contracts and Other   Total Allowance for credit loss as of July 30, 2011 $ 237   $ 103   $ 27   $ 367 Provisions, net 2   5   2   9 Foreign exchange and other (6 )   (5 )   —   (11 ) Allowance for credit loss as of October 29, 2011 $ 233   $ 103   $ 29   $ 365 Gross receivables as of October 29, 2011, net of unearned income $ 2,849   $ 1,468   $ 2,557   $ 6,874
Financing Guarantees	The aggregate amounts of financing guarantees outstanding at October 27, 2012 and July 28, 2012, representing the total maximum potential future payments under financing arrangements with third parties along with the related deferred revenue, are summarized in the following table (in millions):     October 27, 2012   July 28, 2012 Maximum potential future payments relating to financing guarantees:       Channel partner $ 372   $ 277 End user 243   232 Total $ 615   $ 509 Deferred revenue associated with financing guarantees:       Channel partner $ (221 )   $ (193 ) End user (215 )   (200 ) Total $ (436 )   $ (393 ) Maximum potential future payments relating to financing guarantees, net of associated deferred revenue $ 179   $ 116

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Investments (Tables)	3 Months Ended
Oct. 27, 2012
Investments [Abstract]
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	The following tables summarize the Company’s available-for-sale investments (in millions): October 27, 2012 Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value Fixed income securities:               U.S. government securities $ 26,401   $ 22   $ (9 )   $ 26,414 U.S. government agency securities 4,441   14   —   4,455 Non-U.S. government and agency securities 1,388   8   —   1,396 Corporate debt securities 6,105   96   (2 )   6,199 Total fixed income securities 38,335   140   (11 )   38,464 Publicly traded equity securities 1,263   512   (12 )   1,763 Total $ 39,598   $ 652   $ (23 )   $ 40,227 July 28, 2012 Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value Fixed income securities:               U.S. government securities $ 24,201   $ 41   $ (1 )   $ 24,241 U.S. government agency securities 5,367   21   —   5,388 Non-U.S. government and agency securities 1,629   9   —   1,638 Corporate debt securities 5,959   74   (3 )   6,030 Total fixed income securities 37,156   145   (4 )   37,297 Publicly traded equity securities 1,107   524   (11 )   1,620 Total $ 38,263   $ 669   $ (15 )   $ 38,917
Schedule of Realized Gain (Loss) [Table Text Block]	The following table presents the gross realized gains and gross realized losses related to the Company’s available-for-sale investments (in millions): Three Months Ended October 27, 2012   October 29, 2011 Gross realized gains $ 72   $ 236 Gross realized losses (45 )   (227 ) Total $ 27   $ 9 The following table presents the realized net gains (losses) related to the Company's available-for-sale investments by security type (in millions): Three Months Ended October 27, 2012   October 29, 2011 Net gains (losses) on investments in publicly traded equity securities $ 10   $ (16 ) Net gains on investments in fixed income securities 17   25          Total $ 27   $ 9
Schedule of Unrealized Loss on Investments [Table Text Block]	The following tables present the breakdown of the available-for-sale investments with gross unrealized losses and the duration that those losses had been unrealized at October 27, 2012 and July 28, 2012 (in millions):   UNREALIZED LOSSES LESS THAN 12 MONTHS   UNREALIZED LOSSES 12 MONTHS OR GREATER   TOTAL October 27, 2012 Fair Value   Gross Unrealized Losses   Fair Value   Gross Unrealized Losses   Fair Value   Gross  Unrealized  Losses Fixed income securities:                       U.S. government agency securities  $ 12,477   $ (9 )   $ —   $ —   $ 12,477   $ (9 ) Corporate debt securities 469   (2 )   —   —   469   (2 ) Total fixed income securities 12,946   (11 )   —   —   12,946   (11 ) Publicly traded equity securities 270   (12 )   —   —   270   (12 ) Total $ 13,216   $ (23 )   $ —   $ —   $ 13,216   $ (23 )   UNREALIZED LOSSES LESS THAN 12 MONTHS   UNREALIZED LOSSES 12 MONTHS OR GREATER   TOTAL July 28, 2012 Fair Value   Gross Unrealized Losses   Fair Value   Gross Unrealized Losses   Fair Value   Gross  Unrealized  Losses Fixed income securities:                       U.S. government agency securities  $ 5,357   $ (1 )   $ —   $ —   $ 5,357   $ (1 ) Corporate debt securities 603   (3 )   14   —   617   (3 ) Total fixed income securities 5,960   (4 )   14   —   5,974   (4 ) Publicly traded equity securities 167   (8 )   20   (3 )   187   (11 ) Total $ 6,127   $ (12 )   $ 34   $ (3 )   $ 6,161   $ (15 )
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table summarizes the maturities of the Company’s fixed income securities at October 27, 2012 (in millions):    Amortized Cost   Fair Value Less than 1 year $ 17,224   $ 17,238 Due in 1 to 2 years 10,763   10,798 Due in 2 to 5 years 10,265   10,339 Due after 5 years 83   89 Total $ 38,335   $ 38,464

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Fair Value (Tables)	3 Months Ended
Oct. 27, 2012
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Assets and liabilities measured at fair value on a recurring basis as of October 27, 2012 and July 28, 2012 were as follows (in millions):   OCTOBER 27, 2012 FAIR VALUE MEASUREMENTS   JULY 28, 2012 FAIR VALUE MEASUREMENTS   Level 1   Level 2   Level 3   Total Balance   Level 1   Level 2   Level 3   Total Balance Assets                               Cash equivalents:                               Money market funds $ 2,373   $ —   $ —   $ 2,373   $ 2,506   $ —   $ —   $ 2,506 Available-for-sale investments:                               U.S. government securities —   26,414   —   26,414   —   24,241   —   24,241 U.S. government agency securities —   4,455   —   4,455   —   5,388   —   5,388 Non-U.S. government and agency securities —   1,396   —   1,396   —   1,638   —   1,638 Corporate debt securities —   6,199   —   6,199   —   6,030   —   6,030 Publicly traded equity securities 1,763   —   —   1,763   1,620   —   —   1,620 Derivative assets —   273   1   274   —   263   1   264 Total $ 4,136   $ 38,737   $ 1   $ 42,874   $ 4,126   $ 37,560   $ 1   $ 41,687 Liabilities:                               Derivative liabilities $ —   $ 55   $ —   $ 55   $ —   $ 42   $ —   $ 42 Total $ —   $ 55   $ —   $ 55   $ —   $ 42   $ —   $ 42
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended October 29, 2011 (in millions):   Asset-Backed Securities   Derivative Assets   Total Balance at July 30, 2011 $ 121   $ 2   $ 123 Total gains and losses (realized and unrealized):           Included in other income (loss), net —   (1 )   (1 ) Sales and maturities (5 )   —   (5 ) Balance at October 29, 2011 $ 116   $ 1   $ 117 Losses attributable to assets still held as of October 29, 2011 $ —   $ (1 )   $ (1 ) (c)
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]	The following table presents the Company’s financial instruments and nonfinancial assets that were measured at fair value on a nonrecurring basis during the indicated periods and the related recognized gains and losses for the periods (in millions):     October 27, 2012   October 29, 2011     Net Carrying Value as of End of Period   Total Losses for the Period Ended   Net Carrying Value as of End of Period   Total Losses for the Period Ended Investments in privately held companies   $ 42   $ 10   $ 1   $ 1 Property held for sale   $ —   —   $ 24   89 Total losses for nonrecurring measurements       $ 10       $ 90

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Borrowings (Tables)	3 Months Ended
Oct. 27, 2012
Debt Disclosure [Abstract]
Schedule Of Short-Term Debt	The following table summarizes the Company’s short-term debt (in millions, except percentages):   October 27, 2012   July 28, 2012   Amount   Weighted-Average Interest Rate   Amount   Weighted-Average Interest Rate Other notes and borrowings $ 55   7.75 %   $ 31   6.72 %
Schedule Of Long-Term Debt	The following table summarizes the Company's long-term debt (in millions, except percentages):   October 27, 2012   July 28, 2012   Amount   Effective Rate   Amount   Effective Rate Senior Notes:               Floating-rate notes, due 2014 $ 1,250   0.71%   $ 1,250   0.81% 1.625% fixed-rate notes, due 2014 2,000   0.76%   2,000   0.84% 2.90% fixed-rate notes, due 2014 500   3.11%   500   3.11% 5.50% fixed-rate notes, due 2016 3,000   3.14%   3,000   3.16% 3.15% fixed-rate notes, due 2017 750   0.96%   750   1.03% 4.95% fixed-rate notes, due 2019 2,000   5.08%   2,000   5.08% 4.45% fixed-rate notes, due 2020 2,500   4.50%   2,500   4.50% 5.90% fixed-rate notes, due 2039 2,000   6.11%   2,000   6.11% 5.50% fixed-rate notes, due 2040 2,000   5.67%   2,000   5.67% Total 16,000       16,000     Other long-term debt 10   0.19%   10   0.19% Unaccreted discount (68 )       (70 )     Hedge accounting fair value adjustments 330       357     Total long-term debt $ 16,272       $ 16,297
Schedule Of Principal Payments For Long-Term Debt	Future principal payments for long-term debt as of October 27, 2012 are summarized as follows (in millions): Fiscal Year Amount 2013 (remaining nine months) $ — 2014 3,260 2015 500 2016 3,000 2017 750 Thereafter 8,500 Total $ 16,010

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Derivative Instruments (Tables)	3 Months Ended
Oct. 27, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives Recorded At Fair Value	The fair values of the Company's derivative instruments and the line items on the Consolidated Balance Sheets to which they were recorded are summarized as follows (in millions):   DERIVATIVE ASSETS   DERIVATIVE LIABILITIES   Balance Sheet Line Item   October 27, 2012   July 28, 2012   Balance Sheet Line Item   October 27, 2012   July 28, 2012 Derivatives designated as hedging instruments:                       Foreign currency derivatives Other current assets   $ 47   $ 24   Other current liabilities   $ 8   $ 26 Equity derivatives Other current assets   11   —   Other current liabilities   15   4 Interest rate derivatives Other assets   205   223   Other long-term liabilities   —   — Total     263   247       23   30 Derivatives not designated as hedging instruments:                       Foreign currency derivatives Other current assets   10   16   Other current liabilities   32   12 Equity derivatives Other assets   1   1   Other long-term liabilities   —   — Total     11   17       32   12 Total     $ 274   $ 264       $ 55   $ 42
Gains And Losses On Derivatives Designated As Cash Flow Hedges	The effects of the Company's cash flow and net investment hedging instruments on OCI and the Consolidated Statements of Operations are summarized as follows (in millions): GAINS (LOSSES) RECOGNIZED IN OCI ON DERIVATIVES FOR THE THREE MONTHS ENDED (EFFECTIVE PORTION)   GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME FOR THE THREE MONTHS ENDED (EFFECTIVE PORTION) Derivatives designated as cash flow hedging instruments:   October 27, 2012   October 29, 2011   Line Item in Statements of Operations   October 27, 2012   October 29, 2011 Foreign currency derivatives   $ 66   $ (50 )   Operating expenses   $ (4 )   $ —             Cost of sales - service   (1 )   — Total   $ 66   $ (50 )       $ (5 )   $ —                       Derivatives designated as net investment hedging instruments:                     Foreign currency derivatives   $ (24 )   $ (4 )   Other income (loss), net   $ —   $ —
Schedule Of Derivative Fair Value Hedge Instruments Gain Loss In Statement Of Financial Performance [Text Block]	The effect on the Consolidated Statements of Operations of derivative instruments designated as fair value hedges and the underlying hedged items is summarized as follows (in millions):         GAINS (LOSSES) ON DERIVATIVES INSTRUMENTS FOR THE THREE MONTHS ENDED   GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE THREE MONTHS ENDED Derivatives Designated as Fair Value Hedging Instruments   Line Item in Statements of Operations   October 27, 2012   October 29, 2011   October 27, 2012   October 29, 2011 Equity derivatives   Other income (loss), net   $ (3 )   $ —   $ 3   $ — Interest rate derivatives   Interest expense   (18 )   35   18   (36 ) Total       $ (21 )   $ 35   $ 21   $ (36 )
Effect Of Derivative Instruments Not Designated As Fair Value Hedges On Consolidated Statement Of Operations Summary	The effect on the Consolidated Statements of Operations of derivative instruments not designated as hedges is summarized as follows (in millions):         GAINS (LOSSES) FOR THE THREE MONTHS ENDED Derivatives Not Designated as Hedging Instruments   Line Item in Statements of Operations   October 27, 2012   October 29, 2011 Foreign currency derivatives   Other income (loss), net   $ 53   $ (57 ) Total return swaps - deferred compensation   Operating expenses   14   (20 ) Equity derivatives   Other income (loss), net   9   7 Total       $ 76   $ (70 )
Schedule Of Notional Amounts Of Derivatives Outstanding	The notional amounts of the Company’s outstanding derivatives are summarized as follows (in millions):   October 27, 2012   July 28, 2012 Derivatives designated as hedging instruments:       Foreign currency derivatives - cash flow hedges $ 2,504   $ 2,910 Interest rate derivatives 4,250   4,250 Net investment hedging instruments 312   468 Equity derivatives 629   272 Derivatives not designated as hedging instruments:       Foreign currency derivatives 5,036   6,241 Total return swaps-deferred compensation 308   269 Total $ 13,039   $ 14,410

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Commitments And Contingencies (Tables)	3 Months Ended
Oct. 27, 2012
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Future Annual Minimum Lease Payments Under All Noncancelable Operating Leases	Future minimum lease payments under all noncancelable operating leases with an initial term in excess of one year as of October 27, 2012 are as follows (in millions): Fiscal Year Amount 2013 (remaining nine months) $ 270 2014 277 2015 225 2016 114 2017 81 Thereafter 215 Total $ 1,182
Schedule Of Product Warranty Liability	The following table summarizes the activity related to product warranty liability during the three months ended October 27, 2012 and October 29, 2011 (in millions):   Three Months Ended   October 27, 2012   October 29, 2011 Balance at beginning of period $ 415   $ 342 Provision for warranties issued 162   151 Payments (155 )   (132 ) Balance at end of period $ 422   $ 361

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Shareholders' Equity (Tables)	3 Months Ended
Oct. 27, 2012
Stockholders' Equity Note [Abstract]
Stock Repurchase Program	A summary of the stock repurchase activity under the stock repurchase program, reported based on the trade date, is summarized as follows (in millions, except per-share amounts):   Shares Repurchased   Weighted- Average Price per Share   Amount Repurchased Cumulative balance at July 28, 2012 3,740   $ 20.36   $ 76,133 Repurchase of common stock under the stock repurchase program 15   16.44   253 Cumulative balance at October 27, 2012 3,755   $ 20.34   $ 76,386
Components Of AOCI, Net Of Tax	The components of AOCI, net of tax, and the other comprehensive income (loss), excluding noncontrolling interest, for the three months ended October 27, 2012 and October 29, 2011 are summarized as follows (in millions):   Net Unrealized Gains on Investments   Net Unrealized Gains (Losses) Cash Flow Hedging Instruments   Cumulative Translation Adjustment and Other   Accumulated Other Comprehensive Income BALANCE AT JULY 28, 2012 $ 409   $ (53 )   $ 305   $ 661 Other comprehensive income (loss) attributable to Cisco Systems, Inc. (13 )   71   114   172 BALANCE AT OCTOBER 27, 2012 $ 396   $ 18   $ 419   $ 833                   Net Unrealized Gains on Investments   Net Unrealized Gains (Losses) Cash Flow Hedging Instruments   Cumulative Translation Adjustment and Other   Accumulated Other Comprehensive Income BALANCE AT JULY 30, 2011 $ 487   $ 6   $ 801   $ 1,294 Other comprehensive loss attributable to Cisco Systems, Inc. (52 )   (50 )   (211 )   (313 ) BALANCE AT OCTOBER 29, 2011 $ 435   $ (44 )   $ 590   $ 981

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Employee Benefit Plans (Tables)	3 Months Ended
Oct. 27, 2012
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Summary Of Share-Based Compensation Expense	Share-based compensation expense consists primarily of expenses for stock options, stock purchase rights, restricted stock, and restricted stock units granted to employees. The following table summarizes share-based compensation expense (in millions):   Three Months Ended   October 27, 2012   October 29, 2011 Cost of sales - product $ 10   $ 13 Cost of sales - service 35   37 Share-based compensation expense in cost of sales 45   50 Research and development 84   101 Sales and marketing 130   142 General and administrative 50   48 Restructuring and other charges (3 )   — Share-based compensation expense in operating expenses 261   291 Total share-based compensation expense $ 306   $ 341
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A summary of share-based awards available for grant is as follows (in millions):   Share-Based Awards Available for Grant BALANCE AT JULY 30, 2011 255 Restricted stock, stock units, and other share-based awards granted (95 ) Share-based awards canceled/forfeited/expired 64 Other (6 ) BALANCE AT JULY 28, 2012 218 Restricted stock, stock units, and other share-based awards granted (23 ) Share-based awards canceled/forfeited/expired 74 Other (3 ) BALANCE AT OCTOBER 27, 2012 266
Summary Of Restricted Stock And Stock Unit Activity	A summary of the restricted stock and stock unit activity, which includes time-based and performance-based or market-based restricted stock, is as follows (in millions, except per-share amounts):   Restricted Stock/ Stock Units   Weighted-Average Grant Date Fair Value per Share   Aggregated Fair Market Value UNVESTED BALANCE AT JULY 30, 2011 116   $ 21.50     Granted and assumed 65   17.45     Vested (35 )   21.94   $ 580 Canceled/forfeited (18 )   20.38     UNVESTED BALANCE AT JULY 28, 2012 128   19.46     Granted and assumed 15   18.03     Vested (31 )   21.08   $ 593 Canceled/forfeited (3 )   19.62     UNVESTED BALANCE AT OCTOBER 27, 2012 109   $ 18.80
Summary Of Stock Option Activity	A summary of the stock option activity is as follows (in millions, except per-share amounts):   STOCK OPTIONS OUTSTANDING   Number Outstanding   Weighted-Average Exercise Price per Share BALANCE AT JULY 30, 2011 621   $ 21.79 Assumed from acquisitions 1   2.08 Exercised (66 )   13.51 Canceled/forfeited/expired (36 )   23.40 BALANCE AT JULY 28, 2012 520   22.68 Exercised (8 )   14.21 Canceled/forfeited/expired (70 )   20.73 BALANCE AT OCTOBER 27, 2012 442   $ 23.15
Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options	The following table summarizes significant ranges of outstanding and exercisable stock options as of October 27, 2012 (in millions, except years and share prices):   STOCK OPTIONS OUTSTANDING   STOCK OPTIONS EXERCISABLE Range of Exercise Prices Number Outstanding   Weighted- Average Remaining Contractual Life (in Years)   Weighted- Average Exercise Price per Share   Aggregate Intrinsic Value   Number Exercisable   Weighted- Average Exercise Price per Share   Aggregate Intrinsic Value $  0.01 – 15.00 8   3.80   $ 7.57   $ 78   7   $ 7.88   $ 70 15.01 – 18.00 76   1.90   17.79   2   76   17.79   2 18.01 – 20.00 95   1.10   19.17   —   95   19.17   — 20.01 – 25.00 135   2.66   22.78   —   134   22.78   — 25.01 – 35.00 128   3.84   30.66   —   126   30.70   — Total 442   2.55   $ 23.15   $ 80   438   $ 23.17   $ 72

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Income Taxes (Tables)	3 Months Ended
Oct. 27, 2012
Income Tax Disclosure [Abstract]
Income tax provision [Table Text Block]	The following table provides details of income taxes (in millions, except percentages):   Three Months Ended   October 27, 2012   October 29, 2011 Income before provision for income taxes $ 2,631   $ 2,245 Provision for income taxes $ 539   $ 468 Effective tax rate 20.5 %   20.8 %

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Segment Information And Major Customers (Tables)	3 Months Ended
Oct. 27, 2012
Reconciliation from Segment Totals to Consolidated [Abstract]
Reportable Segments	Summarized financial information by segment for the three months ended October 27, 2012 and October 29, 2011, based on the Company's internal management system and as utilized by the Company's Chief Operating Decision Maker ("CODM"), is as follows (in millions):   Three Months Ended   October 27, 2012 October 29, 2011 Net sales:       Americas $ 7,023   $ 6,588 EMEA 2,841   2,845 APJC 2,012   1,823 Total $ 11,876   $ 11,256 Gross margin:       Americas 4,468   4,160 EMEA 1,798   1,754 APJC 1,176   1,108 Segment total 7,442   7,022 Unallocated corporate items (203 )   (132 ) Total $ 7,239   $ 6,890
Segment Reporting Product And Services Net Sales [Text Block]	The following table presents net sales for groups of similar products and services (in millions):   Three Months Ended   October 27, 2012     October 29, 2011 Net sales:         Switching $ 3,616     $ 3,687 NGN Routing 2,052     2,094 Service Provider Video 1,148     883 Collaboration 1,020     1,108 Wireless 486     353 Data Center 417     259 Security 338     319 Other 220     249 Product 9,297     8,952 Service 2,579     2,304 Total $ 11,876     $ 11,256
Entity Wide Disclosure On Geographic Areas Long Lived Assets [Text Block]	Property and equipment information is based on the physical location of the assets. The following table presents property and equipment information for geographic areas (in millions):   October 27, 2012   July 28, 2012 Property and equipment, net:       United States $ 2,801   $ 2,842 International 608   560 Total $ 3,409   $ 3,402

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Net Income Per Share (Tables)	3 Months Ended
Oct. 27, 2012
Earnings Per Share [Abstract]
Calculation Of Basic And Diluted Net Income Per Share	The following table presents the calculation of basic and diluted net income per share (in millions, except per-share amounts):   Three Months Ended   October 27, 2012   October 29, 2011 Net income $ 2,092   $ 1,777 Weighted-average shares - basic 5,301   5,394 Effect of dilutive potential common shares 33   13 Weighted-average shares - diluted 5,334   5,407 Net income per share - basic $ 0.39   $ 0.33 Net income per share - diluted $ 0.39   $ 0.33 Antidilutive employee share-based awards, excluded 438   679

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Supplemental Information Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Supplementary Information[Line Items]
Aggregate Authorized Common Stock Repurchase	$ 82,000,000,000
Repurchases of common stock under the repurchase program, shares	3,755	3,740
Repurchases of common stock under the repurchase program, value	76,386,000,000	76,133,000,000
Common Stock [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, shares	3,755
Common Stock Including Additional Paid in Capital [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	17,155,000,000
Retained Earnings [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	59,231,000,000
Parent [Member]
Supplementary Information[Line Items]
Repurchases of common stock under the repurchase program, value	$ 76,386,000,000

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Business Combinations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012 NDS Group Limited [Member]	Oct. 27, 2012 Other Acquisition [Member] acquisition	Jan. 26, 2013 Meraki Inc. [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired				3
Business Combination, Consideration Transferred			$ 5,005	$ 5	$ 1,200
Cash Acquired from Acquisition			98
Business Combination, Acquisition Related Costs	$ 6	$ 2

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Business Combinations (Summary Of Allocation Of Total Purchase Consideration) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012
NDS Group Limited [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	$ 4,012
Repayments of Assumed Debt	993
Business Combination, Consideration Transferred	5,005
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents	98
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	199
Business Acquisition, Purchase Price Allocation, Tangible Assets	268
Business Acquisition, Purchase Price Allocation, Goodwill Amount	3,444
allocation of purchase consideration purchased intangible assets	1,746
Business Acquisition, Purchase Price Allocation, Deferred Income Taxes, Asset (Liability), Net	(378)
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	(372)
Other Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	5
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1
allocation of purchase consideration purchased intangible assets	7
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	$ (3)

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Goodwill And Purchased Intangible Assets (Scedule Of Goodwill By Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012	Oct. 27, 2012 Americas [Member]	Jul. 28, 2012 Americas [Member]	Oct. 27, 2012 Europe Middle East And Africa [Member]	Jul. 28, 2012 Europe Middle East And Africa [Member]	Oct. 27, 2012 Asia Pacific Japan And China [Member]	Jul. 28, 2012 Asia Pacific Japan And China [Member]	Oct. 27, 2012 NDS Group Limited [Member]	Oct. 27, 2012 NDS Group Limited [Member] Americas [Member]	Oct. 27, 2012 NDS Group Limited [Member] Europe Middle East And Africa [Member]	Oct. 27, 2012 NDS Group Limited [Member] Asia Pacific Japan And China [Member]	Oct. 27, 2012 Other Acquisition [Member]	Oct. 27, 2012 Other Acquisition [Member] Americas [Member]	Oct. 27, 2012 Other Acquisition [Member] Europe Middle East And Africa [Member]	Oct. 27, 2012 Other Acquisition [Member] Asia Pacific Japan And China [Member]
Balance, beginning	$ 20,443	$ 16,998	$ 12,986	$ 11,755	$ 4,614	$ 3,287	$ 2,843	$ 1,956
Acquisitions									3,444	1,230	1,327	887	1	1	0	0
Balance, ending	$ 20,443	$ 16,998	$ 12,986	$ 11,755	$ 4,614	$ 3,287	$ 2,843	$ 1,956

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Goodwill And Purchased Intangible Assets (Schedule Of Intangible Assets Acquired Through Business Combinations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012 Y
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite and finite-lived intangible assets	$ 1,753
IPR&D With Indefinite Lives [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite lives	94
Technology [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired finite-lived	814
Customer Relationships [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired finite-lived	818
Finite Lived Intangible Other [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired finite-lived	27
NDS Group Limited [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite and finite-lived intangible assets	1,746
NDS Group Limited [Member] | IPR&D With Indefinite Lives [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite lives	94
NDS Group Limited [Member] | Technology [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	6.4
Amount, acquired finite-lived	807
NDS Group Limited [Member] | Customer Relationships [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	6.7
Amount, acquired finite-lived	818
NDS Group Limited [Member] | Finite Lived Intangible Other [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	7.4
Amount, acquired finite-lived	27
Other Acquisition [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite and finite-lived intangible assets	7
Other Acquisition [Member] | IPR&D With Indefinite Lives [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Amount, acquired indefinite lives	0
Other Acquisition [Member] | Technology [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	3
Amount, acquired finite-lived	7
Other Acquisition [Member] | Customer Relationships [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	0
Amount, acquired finite-lived	0
Other Acquisition [Member] | Finite Lived Intangible Other [Member]
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Weighted-Average Useful Life (in Years)	0
Amount, acquired finite-lived	$ 0

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Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	$ 6,299
Finite-Lived Intangible Assets, Accumulated Amortization	(2,850)
Intangible Assets, Net (Excluding Goodwill)	3,449	1,959
Technology [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	3,053	2,267
Finite-Lived Intangible Assets, Accumulated Amortization	(1,027)	(908)
Intangible Assets, Net (Excluding Goodwill)	2,026	1,359
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	3,079	2,261
Finite-Lived Intangible Assets, Accumulated Amortization	(1,780)	(1,669)
Intangible Assets, Net (Excluding Goodwill)	1,299	592
Finite Lived Intangible Other [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	73	49
Finite-Lived Intangible Assets, Accumulated Amortization	(43)	(41)
Intangible Assets, Net (Excluding Goodwill)	30	8
Total Purchased Intangible Assets With Finite Lives [Member]
Business Acquisition [Line Items]
Intangible Assets Gross Excluding Goodwill	6,205	4,577
Finite-Lived Intangible Assets, Accumulated Amortization	(2,850)	(2,618)
Intangible Assets, Net (Excluding Goodwill)	3,355	1,959
In Process Research And Development With Indefinite Lives [Member]
Business Acquisition [Line Items]
Gross In Process Research Development With Indefinite Lives	94
Net In Process Research Development With Indefinite Lives	$ 94

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Goodwill And Purchased Intangible Assets (Schedule Of Amortization Of Purchased Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Acquired Intangible Assets	$ 265	$ 195
Cost of Sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Acquired Intangible Assets	143	96
Operating Expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Acquired Intangible Assets	$ 122	$ 99

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Goodwill And Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012
Disclosure Goodwill And Purchased Intangible Assets Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets [Abstract]
2013 (remaining nine months)	$ 702
2014	785
2015	701
2016	474
2017	325
Thereafter	368
Total	$ 3,355

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Restructuring And Other Charges (Additional Information) (Detail) (USD $) In Billions, unless otherwise specified	Oct. 27, 2012
Restructuring Charges [Abstract]
Pre Tax Restructuring Charge	$ 1.1

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Restructuring And Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Oct. 27, 2012	Jul. 28, 2012	Jul. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Period Expense	$ 59	$ 353	$ 799
Change In Estimate Of Restructuring Reserves		(49)
Restructuring Reserve, Settled with Cash	(96)	(436)	(449)
Restructuring Reserve, Settled without Cash	(1)	(20)	(88)
Restructuring Reserve	72	110	262
Special Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Period Expense	0	0	453
Change In Estimate Of Restructuring Reserves		0
Restructuring Reserve, Settled with Cash	0	(17)	(436)
Restructuring Reserve, Settled without Cash	0	0	0
Restructuring Reserve	0	0	17
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Period Expense	65	299	247
Change In Estimate Of Restructuring Reserves		(49)
Restructuring Reserve, Settled with Cash	(89)	(401)	(13)
Restructuring Reserve, Settled without Cash	0	0	0
Restructuring Reserve	59	83	234
Goodwill And Intangible Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Period Expense	0	0	71
Change In Estimate Of Restructuring Reserves		0
Restructuring Reserve, Settled with Cash	0	0	0
Restructuring Reserve, Settled without Cash	0	0	(71)
Restructuring Reserve	0	0	0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Period Expense	(6)	54	28
Change In Estimate Of Restructuring Reserves		0
Restructuring Reserve, Settled with Cash	(7)	(18)	0
Restructuring Reserve, Settled without Cash	(1)	(20)	(17)
Restructuring Reserve	$ 13	$ 27	$ 11

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Balance Sheet Details (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Inventories:
Raw materials	$ 101		$ 127
Work in process	36		35
Distributor inventory and deferred cost of sales	671		630
Manufactured finished goods	615		597
Total finished goods	1,286		1,227
Service-related spares	237		213
Demonstration systems	49		61
Total	1,709		1,663
Property and Equipment, net:
Land, buildings, and building & leasehold improvements	4,458		4,363
Computer equipment and related software	1,491		1,469
Production, engineering, and other equipment	5,495		5,364
Operating lease assets	312	[1]	300	[1]
Furniture and fixtures	494		487
Property, plant and equipment, gross	12,250		11,983
Less accumulated depreciation and amortization	(8,841)		(8,581)
Total	3,409		3,402
Other Assets:
Deferred tax assets	2,061		2,270
Investments in privately held companies	830		858
Other	849		754
Total	3,740		3,882
Deferred Revenue:
Deferred Revenue Services	8,753		9,173
Unrecognized revenue on product shipments and other deferred revenue	3,074		2,975
Cash receipts related to unrecognized revenue from two-tier distributors	796		732
Total product deferred revenue	3,870		3,707
Deferred Revenue	12,623		12,880
Current	8,721		8,852
Noncurrent	3,902		4,028
Total	$ 12,623		$ 12,880
[1]	Accumulated depreciation related to operating lease assets was $192 and $181 as of October 27, 2012 and July 28, 2012, respectively.

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Balance Sheet Details Balance Sheet Details (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Disclosure Balance Sheet Details [Abstract]
Property Subject to or Available for Operating Lease, Accumulated Depreciation	$ 192	$ 181

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Financing Receivables And Guarantees (Additional Information) (Detail) (USD $)	3 Months Ended
Oct. 27, 2012 D	Oct. 29, 2011	Jul. 28, 2012
Financing Receivables And Guarantees [Line Items]
Deferred Service Revenue	$ 12,623,000,000		$ 12,880,000,000
Risk rating for receivables deemed to be impaired, minimum	8
Financing receivables, amount past due on accrual status	140,000,000		109,000,000
Channel partners revolving short-term financing payment term, minimum (days)	60
Channel partners revolving short-term financing payment term, maximum (days)	90
Volume of channel partner financing	5,600,000,000	5,300,000,000
Balance of the channel partner financing subject to guarantees	1,400,000,000	1,500,000,000
End User Lease And Loan Term Maximum	3 years
Third Parties Financing Arrangements With Company Guarantee	44,000,000	35,000,000
Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Average term of lease and loan arrangements, years	4 years
Unbilled Or Current In Greater Than Ninety Days Past Due	157,000,000		139,000,000
Loans Receivable [Member]
Financing Receivables And Guarantees [Line Items]
Term Of Loan Receivable Arrangement	3 years
Capital Leases, Net Investment in Direct Financing Leases	1,816,000,000	1,468,000,000	1,796,000,000
Unbilled Or Current In Greater Than Ninety Days Past Due	15,000,000		3,000,000
Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Revenue recognition range, low end, in years	1 year
Revenue recognition range, high end, in years	3 years
Deferred Service Revenue	1,810,000,000		1,838,000,000
Capital Leases, Net Investment in Direct Financing Leases	2,639,000,000	2,557,000,000	2,651,000,000
Unbilled Or Current In Greater Than Ninety Days Past Due	377,000,000		313,000,000
Credit Loss Allowances [Member]
Financing Receivables And Guarantees [Line Items]
Financing receivable, allowance for credit loss and deferred revenue	2,321,000,000		2,387,000,000
Capital Leases, Net Investment in Direct Financing Leases	$ 7,795,000,000		$ 7,626,000,000
Internal Credit Rating [Member]
Financing Receivables And Guarantees [Line Items]
Investment Credit Risk Ratings Range Lowest	1
Investment Credit Risk Ratings Range Highest	4
Financing credit risk rating-noninvestment-lowest	5
Financing credit risk rating-noninvestment-highest	6
Financing credit risk rating-substandard	7

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Financing Receivables And Guarantees (Schedule Of Financing Receivables) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes, Loans and Financing Receivable, Net, Noncurrent	$ 3,695	$ 3,585
Lease Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Future Minimum Payments Receivable	3,601	3,429
Unearned income	(261)	(250)
Financing Receivable, Allowance for Credit Losses	(248)	(247)
Financing Receivable, Recorded Investment, Current	1,310	1,200
Notes, Loans and Financing Receivable, Net, Noncurrent	1,782	1,732
Financing Receivable	3,092	2,932
Loan Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Future Minimum Payments Receivable	1,816	1,796
Unearned income	0	0
Financing Receivable, Allowance for Credit Losses	(114)	(122)
Financing Receivable, Recorded Investment, Current	947	968
Notes, Loans and Financing Receivable, Net, Noncurrent	755	706
Financing Receivable	1,702	1,674
Financed Service Contracts And Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Future Minimum Payments Receivable	2,639	2,651
Unearned income	0	0
Financing Receivable, Allowance for Credit Losses	(12)	(11)
Financing Receivable, Recorded Investment, Current	1,469	1,493
Notes, Loans and Financing Receivable, Net, Noncurrent	1,158	1,147
Financing Receivable	2,627	2,640
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Future Minimum Payments Receivable	8,056	7,876
Unearned income	(261)	(250)
Financing Receivable, Allowance for Credit Losses	(374)	(380)
Financing Receivable, Recorded Investment, Current	3,726	3,661
Notes, Loans and Financing Receivable, Net, Noncurrent	3,695	3,585
Financing Receivable	$ 7,421	$ 7,246

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Financing Receivables And Guarantees (Contractual Maturities Of The Gross Lease Receivables) (Detail) (Lease Receivables [Member], USD $) In Millions, unless otherwise specified	Oct. 27, 2012
Lease Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
2013 (remaining nine months)	$ 1,199
2014	1,205
2015	732
2016	342
2017	123
Total	$ 3,601

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Financing Receivables And Guarantees (Schedule Of Financing Receivables Categorized By Internal Credit Risk Rating) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012	Oct. 29, 2011
Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	$ 1,816	$ 1,796	$ 1,468
Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	2,639	2,651	2,557
Rating One To Four [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	4,078	3,915
Rating One To Four [Member] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,602	1,532
Rating One To Four [Member] | Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	945	831
Rating One To Four [Member] | Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,531	1,552
Rating Five To Six [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	3,261	3,293
Rating Five To Six [Member] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,417	1,342
Rating Five To Six [Member] | Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	834	921
Rating Five To Six [Member] | Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,010	1,030
Rating Seven And Higher [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	177	144
Rating Seven And Higher [Member] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	42	31
Rating Seven And Higher [Member] | Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	37	44
Rating Seven And Higher [Member] | Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	98	69
Total Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	7,516	7,352
Total Internal Credit Risk Rating [Member] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	3,061	2,905
Total Internal Credit Risk Rating [Member] | Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,816	1,796
Total Internal Credit Risk Rating [Member] | Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	2,639	2,651
Residual Value [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	279	274
Residual Value [Member] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	279	274
Residual Value [Member] | Loan Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	0	0
Residual Value [Member] | Financed Service Contracts And Other [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	0	0
Internal Credit Risk Rating [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	7,795	7,626
Financing Receivable, Recorded Investment, Class of Financing Receivable [Domain] | Lease Receivables [Member]
Financing Receivables And Guarantees [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	$ 3,340	$ 3,179	$ 2,849

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Financing Receivables And Guarantees (Schedule Of Financing Receivables By Portfolio Segment And Class Aging Analysis) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Class Of Financing Receivable Thirty One To Sixty Days Past Due	$ 158	$ 250
Class Of Financing Receivable Sixty One To Ninety Days Past Due	206	145
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	706	576
Financing Receivable, Recorded Investment, Past Due	1,070	971
Class Of Financing Receivable Current	6,725	6,655
Class Of Financing Receivables Net Of Unearned Income	7,795	7,626
Financing Receivable, Recorded Investment, Nonaccrual Status	45	45
Impaired Financing Receivable, Recorded Investment	28	28
Lease Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Class Of Financing Receivable Thirty One To Sixty Days Past Due	88	151
Class Of Financing Receivable Sixty One To Ninety Days Past Due	76	69
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	206	173
Financing Receivable, Recorded Investment, Past Due	370	393
Class Of Financing Receivable Current	2,970	2,786
Financing Receivable, Recorded Investment, Nonaccrual Status	23	23
Impaired Financing Receivable, Recorded Investment	15	14
Loan Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Class Of Financing Receivable Thirty One To Sixty Days Past Due	6	10
Class Of Financing Receivable Sixty One To Ninety Days Past Due	0	8
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	23	11
Financing Receivable, Recorded Investment, Past Due	29	29
Class Of Financing Receivable Current	1,787	1,767
Class Of Financing Receivables Net Of Unearned Income	1,816	1,796
Financing Receivable, Recorded Investment, Nonaccrual Status	6	4
Impaired Financing Receivable, Recorded Investment	6	4
Financed Service Contracts And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Class Of Financing Receivable Thirty One To Sixty Days Past Due	64	89
Class Of Financing Receivable Sixty One To Ninety Days Past Due	130	68
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	477	392
Financing Receivable, Recorded Investment, Past Due	671	549
Class Of Financing Receivable Current	1,968	2,102
Class Of Financing Receivables Net Of Unearned Income	2,639	2,651
Financing Receivable, Recorded Investment, Nonaccrual Status	16	18
Impaired Financing Receivable, Recorded Investment	7	10
Gross Receivables, Net of Unearned Income [Member] | Lease Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Class Of Financing Receivables Net Of Unearned Income	$ 3,340	$ 3,179

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Financing Receivables And Guarantees (Allowance For Credit Loss And Related Financing Receivables) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011	Jul. 28, 2012	Jul. 31, 2010
Lease Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 247			$ 237
Provisions	(2)	2
Foreign exchange and other	3	(6)
Financing Receivable, Allowance for Credit Losses	248	233		237
Loan Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	122			103
Provisions	(10)	5
Foreign exchange and other	2	(5)
Financing Receivable, Allowance for Credit Losses	114	103		103
Capital Leases, Net Investment in Direct Financing Leases	1,816	1,468	1,796
Financed Service Contracts And Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	11			27
Provisions	1	2
Foreign exchange and other	0	0
Financing Receivable, Allowance for Credit Losses	12	29		27
Capital Leases, Net Investment in Direct Financing Leases	2,639	2,557	2,651
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	380			367
Provisions	(11)	9
Foreign exchange and other	5	(11)
Financing Receivable, Allowance for Credit Losses	374	365		367
Capital Leases, Net Investment in Direct Financing Leases	7,795	6,874
Gross Receivables, Net of Unearned Income [Member] | Lease Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Capital Leases, Net Investment in Direct Financing Leases	$ 3,340	$ 2,849	$ 3,179

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Financing Receivables And Guarantees (Schedule Of Financing Guarantees Outstanding) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees	$ 615	$ 509
Deferred revenue associated with financing guarantees	(436)	(393)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue	179	116
Channel Partner [Member]
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees	372	277
Deferred revenue associated with financing guarantees	(221)	(193)
End User [Member]
Loss Contingencies [Line Items]
Maximum potential future payments relating to financing guarantees	243	232
Deferred revenue associated with financing guarantees	$ (215)	$ (200)

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Investments - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Disclosure Investments Additional Information [Abstract]
Average Balance Of Securities Lending	$ 0.8	$ 0.6
Fair Value Of Securities Received As Collateral That Can Be Resold Or RePledged Percentage	102.00%

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Investments (Summary Of Available-For-Sale Investments) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 39,598	$ 38,263
Available-for-sale Securities, Gross Unrealized Gains	652	669
Available-for-sale Securities, Gross Unrealized Losses	(23)	(15)
Available-for-sale Securities, Fair Value Disclosure	40,227	38,917
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,263	1,107
Available-for-sale Securities, Gross Unrealized Gains	512	524
Available-for-sale Securities, Gross Unrealized Losses	(12)	(11)
Available-for-sale Securities, Fair Value Disclosure	1,763	1,620
Fixed Income Investments [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	38,335	37,156
Available-for-sale Securities, Gross Unrealized Gains	140	145
Available-for-sale Securities, Gross Unrealized Losses	(11)	(4)
Available-for-sale Securities, Fair Value Disclosure	38,464	37,297
Fixed Income Investments [Member] | US Treasury and Government [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	26,401	24,201
Available-for-sale Securities, Gross Unrealized Gains	22	41
Available-for-sale Securities, Gross Unrealized Losses	(9)	(1)
Available-for-sale Securities, Fair Value Disclosure	26,414	24,241
Fixed Income Investments [Member] | US Government Agencies Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,441	5,367
Available-for-sale Securities, Gross Unrealized Gains	14	21
Available-for-sale Securities, Fair Value Disclosure	4,455	5,388
Fixed Income Investments [Member] | Foreign Government Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,388	1,629
Available-for-sale Securities, Gross Unrealized Gains	8	9
Available-for-sale Securities, Fair Value Disclosure	1,396	1,638
Fixed Income Investments [Member] | Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,105	5,959
Available-for-sale Securities, Gross Unrealized Gains	96	74
Available-for-sale Securities, Gross Unrealized Losses	(2)	(3)
Available-for-sale Securities, Fair Value Disclosure	$ 6,199	$ 6,030

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Investments (Gross Realized Gains And Gross Realized Losses Related To Available-For-Sale Investments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Gross Realized Gains	$ 72	$ 236
Available-for-sale Securities, Gross Realized Losses	(45)	(227)
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 27	$ 9

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Investments (Realized Net Gains (Losses) Related To Available-For-Sale Investments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Available-for-sale Securities, Gross Realized Gains	$ 72	$ 236
Available-for-sale Securities, Gross Realized Losses	45	227
Net gains (losses) on investments	27	9
Publicly Traded Equity Securities [Member]
Available-for-sale Securities, Gross Realized Gains	10	(16)
Fixed Income Securities [Member]
Available-for-sale Securities, Gross Realized Losses	$ 17	$ 25

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Investments (Available-For-Sale Investments With Gross Unrealized Losses) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 13,216	$ 6,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(23)	(12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		34
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	13,216	6,161
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(23)	(15)
Publicly Traded Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	270	167
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(12)	(8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		20
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	270	187
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(12)	(11)
Total Fixed Income Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,946	5,960
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(11)	(4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,946	5,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(11)	(4)
Total Fixed Income Securities [Member] | U.S. Government Agency Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,477	5,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(9)	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,477	5,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(9)	(1)
Total Fixed Income Securities [Member] | Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	469	603
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2)	(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	469	617
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ (2)	$ (3)

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Investments (Maturities Of Fixed Income Securities) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012
Fixed Income Securities Matures Within One Year [Member]
Schedule of Investments [Line Items]
Fixed Income Available For Sale Debt And Equity Securities Amortized Cost	$ 17,224
Financial Instruments, Owned and Not Pledged, at Fair Value	17,238
Fixed Income Securities Maturities Between One And Two Years [Member]
Schedule of Investments [Line Items]
Fixed Income Available For Sale Debt And Equity Securities Amortized Cost	10,763
Financial Instruments, Owned and Not Pledged, at Fair Value	10,798
Fixed Income Securities Maturities Between Two And Five Years [Member]
Schedule of Investments [Line Items]
Fixed Income Available For Sale Debt And Equity Securities Amortized Cost	10,265
Financial Instruments, Owned and Not Pledged, at Fair Value	10,339
Fixed Income Securities Maturities Beyond Five Years [Member]
Schedule of Investments [Line Items]
Fixed Income Available For Sale Debt And Equity Securities Amortized Cost	83
Financial Instruments, Owned and Not Pledged, at Fair Value	89
Fixed Income Securities [Member]
Schedule of Investments [Line Items]
Fixed Income Available For Sale Debt And Equity Securities Amortized Cost	38,335
Financial Instruments, Owned and Not Pledged, at Fair Value	$ 38,464

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Fair Value - Additional Information (Detail) (USD $)	Oct. 27, 2012	Jul. 28, 2012
Disclosure Fair Value Additional Information [Abstract]
Investment in privately held companies	$ 239,000,000	$ 249,000,000
Loan Receivables And Financed Service Contracts And Others Carrying Value	1,900,000,000	1,900,000,000
Long-term Debt, Fair Value	18,700,000,000	18,800,000,000
Long-term Debt	$ 16,300,000,000	$ 16,300,000,000

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Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	$ 4,136	$ 4,126
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	38,737	37,560
Liabilities, Fair Value Disclosure	55	42
Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	273	263
Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member]
Liabilities, Fair Value Disclosure	55	42
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	1	1
Fair Value, Inputs, Level 3 [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	1	1
Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	42,874	41,687
Liabilities, Fair Value Disclosure	55	42
Total Balance Fair Value Measurements [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	274	264
Total Balance Fair Value Measurements [Member] | Derivative Liabilities [Member]
Liabilities, Fair Value Disclosure	55	42
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	2,373	2,506
Cash and Cash Equivalents [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	2,373	2,506
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	26,414	24,241
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	26,414	24,241
Available-for-sale Securities [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	4,455	5,388
Available-for-sale Securities [Member] | US Government Agencies Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	4,455	5,388
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	1,396	1,638
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	1,396	1,638
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	6,199	6,030
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	6,199	6,030
Available-for-sale Securities [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	1,763	1,620
Equity Securities [Member] | Total Balance Fair Value Measurements [Member] | Available-for-sale Securities [Member]
Assets, Fair Value Disclosure, Recurring	$ 1,763	$ 1,620

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Fair Value (Reconciliation For All Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Detail) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 29, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 123
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	117
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Losses Attributable To Assets Still Held	(1)
Asset-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	121
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	116
Derivative Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Losses Attributable To Assets Still Held	$ (1)

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Fair Value (Fair Value On A Nonrecurring Basis) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012	Oct. 27, 2012 Fair Value, Measurements, Nonrecurring [Member] Net Carrying Value [Member] Fair Value, Inputs, Level 3 [Member]	Oct. 29, 2011 Fair Value, Measurements, Nonrecurring [Member] Net Carrying Value [Member] Fair Value, Inputs, Level 3 [Member]	Oct. 27, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Investments In Privately Held Companies [Member]	Oct. 29, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Investments In Privately Held Companies [Member]	Oct. 29, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Property Held For Sale [Member]	Oct. 27, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Oct. 29, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in privately held companies	$ 239	$ 249	$ 42	$ 1
Property Held For Sale Fair Value Disclosure				24
Fair Value Nonrecurring Basis Gain Loss Recorded Total					$ (10)	$ (1)	$ (89)	$ (10)	$ (90)

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Borrowings - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Oct. 27, 2012	Jul. 30, 2011	Jul. 28, 2012
Subordinated Borrowing [Line Items]
Credit Facility Interest Rate	either (i) the higher of the Federal Funds rate plus 0.50%, Bank of America's "prime rate" as announced from time to time, or one-month LIBOR plus 1.00%, or (ii) LIBOR plus a margin that is based on the Company's senior debt credit ratings
Short-term debt financing program, announced value		$ 3,000,000,000
Notional amount of interest rate derivatives	4,250,000,000		4,250,000,000
Senior Notes Issued 2006 and 2011 [Member]
Subordinated Borrowing [Line Items]
Notional amount of interest rate derivatives	4,250,000,000
Unsecured Revolving Credit Facility [Member]
Subordinated Borrowing [Line Items]
Unsecured Revolving Credit Facility	3,000,000,000
Unsecured revolving credit facility maturity date	February 17, 2017
Interest Rate- Federal Funds rate plus 0.5%	0.50%
Interest Rate- One-month LIBOR plus 1.00%	1.00%
Available increases under the credit facility	$ 2,000,000,000
Increase to maximum borrowing capacity- maturity date	Feb 17, 2019

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Borrowings (Short-Term Debt) (Detail) (Notes Payable, Other Payables [Member], USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Notes Payable, Other Payables [Member]
Short-term Debt [Line Items]
Short-term debt	$ 55	$ 31
Short-term debt, weighted-average interest rate	7.75%	6.72%

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Borrowings (Schedule Of Long-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Long-term debt before Unaccreted discount and Hedge accounting adjustment	$ 16,000	$ 16,000
Unaccreted discount	(68)	(70)
Hedge accounting fair value adjustments	330	357
Total long-term debt	16,272	16,297
Floating-Rate Notes, Due 2014 [Member]
Senior notes	1,250	1,250
Effective rate	0.71%	0.81%
1.625% Fixed-Rate Notes, Due 2014 [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.63%
Senior notes	2,000	2,000
Effective rate	0.76%	0.84%
2.90% Fixed-Rate Notes, Due 2014 [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.90%
Senior notes	500	500
Effective rate	3.11%	3.11%
5.50% Fixed-Rate Notes, Due 2016 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior notes	3,000	3,000
Effective rate	3.14%	3.16%
3.15% Fixed-Rate Notes, Due 2017 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Senior notes	750	750
Effective rate	0.96%	1.03%
4.95% Fixed-Rate Notes, Due 2019 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.95%
Senior notes	2,000	2,000
Effective rate	5.08%	5.08%
4.45% Fixed-Rate Notes, Due 2020 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.45%
Senior notes	2,500	2,500
Effective rate	4.50%	4.50%
5.90% Fixed-Rate Notes, Due 2039 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.90%
Senior notes	2,000	2,000
Effective rate	6.11%	6.11%
5.50% Fixed-Rate Notes, Due 2040 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior notes	2,000	2,000
Effective rate	5.67%	5.67%
Other Long Term Debt [Member]
Other Long-term Debt	$ 10	$ 10
Effective rate	0.19%	0.19%

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Borrowings (Schedule Of Principal Payments For Long-Term Debt ) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012
Debt Disclosure [Abstract]
2013 (remaining nine months)	$ 0
2014	3,260
2015	500
2016	3,000
2017	750
Thereafter	8,500
Total future principal payments for long-term debt	$ 16,010

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Derivative Instruments (Additional Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012
Derivative [Line Items]
Net derivative gains to be reclassified from AOCI into earnings in next twelve months	$ 30
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Foreign currency cash flow hedges maturity period, maximum, months	18

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Derivative Instruments (Derivatives Recorded At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Derivative [Line Items]
Derivative assets	$ 274	$ 264
Derivative liabilities	55	42
Designated As Hedging Instrument [Member]
Derivative [Line Items]
Derivative assets	263	247
Derivative liabilities	23	30
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative assets	11	17
Derivative liabilities	32	12
Foreign Exchange Contract [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative assets	47	24
Foreign Exchange Contract [Member] | Designated As Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	8	26
Foreign Exchange Contract [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative assets	10	16
Foreign Exchange Contract [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	32	12
Equity Derivatives [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivative assets	11
Equity Derivatives [Member] | Designated As Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	15	4
Equity Derivatives [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative assets	1	1
Interest Rate Derivatives [Member] | Designated As Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative assets	$ 205	$ 223

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Derivative Instruments (Effect Of Derivative Instruments Designated As Cash Flow Hedges On Other Comprehensive And Consolidated Statements Of Operations Summary) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Cash Flow Hedging [Member]
Derivative [Line Items]
Gains (losses) recognized in OCI on derivatives (effective portion)	$ 66	$ (50)
Gains (losses) reclassified from AOCI into income (effective portion)	(5)	0
Cash Flow Hedging [Member] | Foreign Currency Derivatives-Cash Flow Hedges [Member]
Derivative [Line Items]
Gains (losses) recognized in OCI on derivatives (effective portion)	66	(50)
Cash Flow Hedging [Member] | Operating Expenses [Member] | Foreign Currency Derivatives-Cash Flow Hedges [Member]
Derivative [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	(4)	0
Cash Flow Hedging [Member] | Cost Of Sales-Service [Member] | Foreign Currency Derivatives-Cash Flow Hedges [Member]
Derivative [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	(1)	0
Net Investment Hedging [Member]
Derivative [Line Items]
Gains (losses) recognized in OCI on derivatives (effective portion)	(24)	(4)
Net Investment Hedging [Member] | Other income (loss), net [Member]
Derivative [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	$ 0	$ 0

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Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations Summary) (Details) (Derivatives Designated As Fair Value Hedging Instruments [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	$ (21)	$ 35
Gains (losses) related to hedged items	21	(36)
Equity Contract [Member] | Other Income (loss), net [Member]
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	(3)	0
Gains (losses) related to hedged items	3	0
Interest Rate Contract [Member] | Interest Expense [Member]
Hedge Underlying Gain Loss [Line Items]
Gains (losses) on derivative instruments	(18)	35
Gains (losses) related to hedged items	$ 18	$ (36)

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Derivative Instruments (Effect Of Derivative Instruments Not Designated As Fair Value Hedges On Consolidated Statement Of Operations Summary) (Details) (Derivatives Not Designated As Hedging Instruments [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Derivative [Line Items]
Gains (losses) recognized in income	$ 76	$ (70)
Foreign Exchange Contract [Member] | Other Income [Member]
Derivative [Line Items]
Gains (losses) recognized in income	53	(57)
Total Return Swaps-Deferred Compensation [Member] | Operating Expenses [Member]
Derivative [Line Items]
Gains (losses) recognized in income	14	(20)
Equity Derivatives [Member] | Other Income [Member]
Derivative [Line Items]
Gains (losses) recognized in income	$ 9	$ 7

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Derivative Instruments (Schedule Of Notional Amounts Of Derivatives Outstanding) (Details) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Notional Amount of Derivatives, [Abstract]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	$ 2,504	$ 2,910
Notional amount of interest rate derivatives	4,250	4,250
Notional Amount of Derivative Instruments Designated as Net Investment Hedges	312	468
Notional Amount of Price Risk Fair Value Hedge Derivatives	629	272
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	5,036	6,241
Notional Amount Of Total Return Swaps Deferred Compensation Derivative Instruments Not Designated As Hedging Instruments	308	269
Notional amounts of derivatives outstanding	$ 13,039	$ 14,410

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Commitments And Contingencies (Additional Information) (Details) (USD $)	Oct. 27, 2012	Jul. 28, 2012	Oct. 27, 2012 Investor [Member]	Jul. 28, 2012 Investor [Member]	Oct. 27, 2012 Acquisition [Member]	Oct. 29, 2011 Acquisition [Member]	Jan. 26, 2013 Insieme Networks Inc [Member]	Oct. 27, 2012 Insieme Networks Inc [Member]	Oct. 27, 2012 VCE [Member]	Oct. 29, 2011 VCE [Member]	Oct. 27, 2012 VCE [Member]	Oct. 27, 2012 Minimum [Member] D Y	Oct. 27, 2012 Maximum [Member] Y	Oct. 27, 2012 Maximum [Member] Insieme Networks Inc [Member]	Oct. 27, 2012 November 2012 Amendment [Member] Maximum [Member] Insieme Networks Inc [Member]
Site Contingency [Line Items]
Term of operating leases, in years												1
Total purchase commitments for inventory	$ 3,725,000,000	$ 3,869,000,000
Liability for unconditional purchase agreements	171,000,000	193,000,000
Compensation expense connection with the business combinations and asset purchases					12,000,000	14,000,000
Future compensation expense & contingent consideration					817,000,000									750,000,000	863,000,000
Funding commitments			124,000,000	120,000,000
Cumulative investment in entity									397,000,000		397,000,000
Percentage of outstanding equity owned in entity							89.00%	86.00%	35.00%		35.00%
Payments to Acquire Additional Interest in Subsidiaries							35,000,000
Percentage of VCE's losses									36.80%	36.80%
Income (Loss) from Equity Method Investments									42,000,000	31,000,000	281,000,000
VCE-Carrying Value									116,000,000		116,000,000
Variable Interest Entity, Financial or Other Support, Amount								100,000,000
Warranty Time Period												90
Warranty Period For Products													5
Brazilian authority claim of import tax evasion by importer, tax portion	427,000,000
Brazilian authority claim of import tax evasion by importer, interest portion	1,100,000,000
Brazilian authority claim of import tax evasion by importer, penalties portion	$ 1,900,000,000

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Commitments And Contingencies (Schedule Of Future Annual Minimum Lease Payments Under All Noncancelable Operating Leases) (Details) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012
Operating Leases, Future Minimum Payments Due [Abstract]
2013 (remaining nine months)	$ 270
2014	277
2015	225
2016	114
2017	81
Thereafter	215
Total	$ 1,182

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Commitments And Contingencies (Schedule Of Product Warranty Liability) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of fiscal year	$ 415	$ 342
Provision for warranties issued	162	151
Payments	(155)	(132)
Balance at end of fiscal year	$ 422	$ 361

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Shareholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended
Jan. 26, 2013	Oct. 27, 2012	Oct. 29, 2011
Shareholders Equity [Line Items]
Adjustments Related to Tax Withholding for Share-based Compensation		$ 203,000,000	$ 137,000,000
Shares Paid for Tax Withholding for Share Based Compensation		11	9
Payments of Dividends		744,000,000	322,000,000
Dividends Payable, Date of Record, Day, Month and Year	Nov 29, 2012
Dividends Payable, Date Declared, Day, Month and Year	Nov 15, 2012
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.06
Dividends Payable, Date to be Paid, Day, Month and Year	Dec 19, 2012
Remaining Aggregate Authorized Common Stock Repurchase		5,600,000,000
Aggregate Authorized Common Stock Repurchase		$ 82,000,000,000

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Shareholders' Equity (Stock Repurchase Program) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2012
Stock Repurchase Program [Roll Forward]
Cumulative shares repurchased, beginning balance	3,740
Shares Repurchased Retired During Period Shares	15
Cumulative shares repurchased, ending balance	3,755
Cumulative weighted-average price per share, beginning balance	$ 20.36
Repurchase of common stock under the stock repurchase program, weighted -average price per share	$ 16.44
Cumulative weighted-average price per share, ending balance	$ 20.34
Cumulative amount repurchased, beginning balance	$ 76,133
Repurchase of common stock under the stock repurchase program, amount	253
Cumulative amount repurchased, ending balance	$ 76,386

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Shareholders' Equity Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Beginning Balance	$ 409	$ 487
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Beginning Balance	(53)	6
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Beginning Balance	305	801
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	661	1,294
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	(13)	(52)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	71	(50)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	114	(211)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	172	(313)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Ending Balance	396	435
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	18	(44)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance	419	590
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 833	$ 981

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Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended		3 Months Ended		1 Months Ended	3 Months Ended		3 Months Ended	12 Months Ended
Oct. 27, 2012 Y	Oct. 29, 2011	Jul. 30, 2012	Jul. 27, 2012	Oct. 27, 2012 Performance Based Restricted Stock Units [Member]	Oct. 29, 2011 Performance Based Restricted Stock Units [Member]	Dec. 31, 2007 Supplemental Plan [Member]	Oct. 27, 2012 Employee Stock Purchase Plan [Member]	Nov. 12, 2009 2005 Plan [Member]	Nov. 12, 2009 2005 Plan [Member] Employee Stock Incentive Plans [Member]	Oct. 27, 2012 2005 Plan [Member] Employee Stock Incentive Plans [Member] M Y	Nov. 15, 2007 2005 Plan [Member] Employee Stock Incentive Plans [Member]	Oct. 27, 2012 2005 Plan [Member] Employee Stock Incentive Plans [Member] Minimum [Member]	Oct. 27, 2012 2005 Plan [Member] Employee Stock Incentive Plans [Member] Maximum [Member]	Oct. 27, 2012 1996 Plan [Member] Employee Stock Incentive Plans [Member] M Y	Oct. 27, 2012 1996 Plan [Member] Employee Stock Incentive Plans [Member] Minimum [Member]	Jul. 29, 2006 1996 Plan [Member] Employee Stock Incentive Plans [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Percentage Maximum														25.00%			25.00%
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Percentage Minimum													20.00%			20.00%
Reduction in number of shares available for issuance after amendment approved by shareholders									1.5	1.5
Unrecognized compensation cost related to unvested share-based awards	$ 1,900,000,000
Expected period of recognition of compensation cost, years	2.3
Income tax benefit for employee share-based compensation expense	$ 79,000,000	$ 90,000,000
Expiration date for stock options and stock appreciation rights, max time from grant date prior to date, in years										nine
Expiration date for stock options and stock appreciation rights, max time from grant date after date, in years											10				9
Shares reserved for issuance								471,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date								15.00%
Closing stock price				$ 17.29
Shares for eligible employees, offering period								Eligible employees are offered shares through a 24-month offering period, which consists of four consecutive 6-month purchase periods
Stock options and stock appreciation rights exercise price percentage of the fair market value of the underlying stock on the grant date											100.00%
Number of months in which stock options ratably exercise, minimum											36				36
Number of months in which stock options ratably exercise, maximum											48				48
Ratable vesting period, months															60
Stock options exercisable	438,000,000		512,000,000
In-the-money exercisable stock option shares	9,000,000
Stock options exercisable, weighted-average exercise price per share	$ 23.17	$ 22.65
Shares reserved in employee stock incentive plan							9,000,000					559,000,000			2,500,000,000
Shares held in Employee Stock Option Plan, Suspense Shares								87,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					4,000,000	1,000,000

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Employee Benefit Plans (Summary Of Share-Based Compensation Expense) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	$ 306	$ 341
Cost Of Sales Product [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	10	13
Cost Of Sales-Service [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	35	37
Share-Based Compensation Expense In Cost Of Sales [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	45	50
Research And Development [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	84	101
Sales And Marketing [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	130	142
General And Administrative [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	50	48
Restructuring And Other Charges [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	(3)	0
Share-Based Compensation Expense In Operating Expenses [Member]
Option Indexed to Issuer's Equity [Line Items]
Allocated Share-based Compensation Expense	$ 261	$ 291

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Employee Benefit Plans (Summary Of Share-Based Awards Available For Grant) (Detail) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Oct. 27, 2012	Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant [Roll Forward]
Beginning balance	218	255
Restricted stock, stock units, and other share-based awards granted and assumed	(23)	(95)
Share-based awards canceled/forfeited/expired	74	64
Stock Option And Other Share Based Awards Granted	(3)	(6)
Ending balance	266	218

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Employee Benefit Plans (Summary Of Restricted Stock And Stock Unit Activity) (Detail) (Restricted Stock And Stock Unit Awards [Member], USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Oct. 27, 2012	Jul. 28, 2012
Restricted Stock And Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance, restricted stock/stock units	128	116
Granted and assumed, restricted stock/stock units	15	65
Vested, restricted stock/stock units	(31)	(35)
Canceled/forfeited, restricted stock/stock units	(3)	(18)
Ending balance, restricted stock/stock units	109	128
Beginning balance, weighted-average grant date fair value per share	$ 19.46	$ 21.5
Granted and assumed, weighted-average grant date fair value per share	$ 18.03	$ 17.45
Vested, weighted-average grant date fair value per share	$ 21.08	$ 21.94
Canceled/forfeited, weighted-average grant date fair value per share	$ 19.62	$ 20.38
Ending balance, weighted-average grant date fair value per share	$ 18.8	$ 19.46
Vested, aggregated fair market value	$ 593	$ 580

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Employee Benefit Plans (Summary Of Stock Option Activity) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Oct. 27, 2012	Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, Number Outstanding	520	621
Granted and assumed, Number Outstanding		1
Exercised, number outstanding	(8)	(66)
Canceled/forfeited/expired, number outstanding	(70)	(36)
Ending balance, Number Outstanding	442	520
Weighted-average exercise price per share, beginning balance	$ 22.68	$ 21.79
Granted and assumed, weighted-average exercise price per share		$ 2.08
Exercised, weighted-average exercise price per share	$ 14.21	$ 13.51
Canceled/forfeited/expired, weighted-average exercise price per share	$ 20.73	$ 23.4
Weighted-average exercise price per share, ending balance	$ 23.15	$ 22.68

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Employee Stock Plans (Summary Of Significant Ranges Of Outstanding And Exercisable Stock Options) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	Oct. 27, 2012 Y	Jul. 30, 2012	Jul. 28, 2012	Oct. 29, 2011	Jul. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	442		520		621
Stock options outstanding, weighted-average remaining contractual life (in years)	2.55
Stock options outstanding, weighted-average exercise price per share	$ 23.15		$ 22.68		$ 21.79
Stock options outstanding, aggregate intrinsic value	$ 80
Stock options exercisable	438	512
Stock options exercisable, weighted-average exercise price per share	$ 23.17			$ 22.65
Stock options exercisable, aggregate intrinsic value	72
Price 0.01 To 15.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	8
Stock options outstanding, weighted-average remaining contractual life (in years)	3.8
Stock options outstanding, weighted-average exercise price per share	$ 7.57
Stock options outstanding, aggregate intrinsic value	78
Stock options exercisable	7
Stock options exercisable, weighted-average exercise price per share	$ 7.88
Stock options exercisable, aggregate intrinsic value	70
Price 15.01 To 18.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	76
Stock options outstanding, weighted-average remaining contractual life (in years)	1.9
Stock options outstanding, weighted-average exercise price per share	$ 17.79
Stock options outstanding, aggregate intrinsic value	2
Stock options exercisable	76
Stock options exercisable, weighted-average exercise price per share	$ 17.79
Stock options exercisable, aggregate intrinsic value	2
Price 18.01 To 20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	95
Stock options outstanding, weighted-average remaining contractual life (in years)	1.1
Stock options outstanding, weighted-average exercise price per share	$ 19.17
Stock options outstanding, aggregate intrinsic value	0
Stock options exercisable	95
Stock options exercisable, weighted-average exercise price per share	$ 19.17
Stock options exercisable, aggregate intrinsic value	0
Price 20.01 To 25.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	135
Stock options outstanding, weighted-average remaining contractual life (in years)	2.66
Stock options outstanding, weighted-average exercise price per share	$ 22.78
Stock options outstanding, aggregate intrinsic value	0
Stock options exercisable	134
Stock options exercisable, weighted-average exercise price per share	$ 22.78
Stock options exercisable, aggregate intrinsic value	0
Price 25.01 To 35.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	128
Stock options outstanding, weighted-average remaining contractual life (in years)	3.84
Stock options outstanding, weighted-average exercise price per share	$ 30.66
Stock options outstanding, aggregate intrinsic value	0
Stock options exercisable	126
Stock options exercisable, weighted-average exercise price per share	$ 30.7
Stock options exercisable, aggregate intrinsic value	$ 0

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Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units)) (Detail) (Time Based Restricted Stock Units R S U [Member], USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Time Based Restricted Stock Units R S U [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equivalent Number Of Shares For Full Value Awards	11	11
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Stock Price	$ 17.65	$ 15.69
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.90%	1.50%

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Income Taxes - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Oct. 27, 2012
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 2.9
Unrecognized tax benefits that would impact tax rate	2.5
Unrecognized tax benefit that could be reduced in next 12 months	1.1
Impact to earnings attributable to unrecognized tax benefits	$ 0.9

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Income Taxes (Income Before Provision For Income Taxes) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 2,631	$ 2,245
Income Tax Expense (Benefit)	$ 539	$ 468
Effective Income Tax Rate, Continuing Operations	20.50%	20.80%

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Segment Information And Major Customers - Additional Information (Detail) (USD $)	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011	Jul. 28, 2012
Segment Reporting Information [Line Items]
Entity-Wide Disclosure on Geographic Areas, Basis for Attributing Revenue to Countries	three
Revenue, Net	$ 11,876,000,000	$ 11,256,000,000
United States [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	7,500,000,000		6,200,000,000
Revenue, Net	6,100,000,000	5,600,000,000
International [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	$ 37,500,000,000		$ 42,500,000,000

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Segment Information And Major Customers (Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Segment Reporting Information [Line Items]
Revenue, Net	$ 11,876	$ 11,256
Gross Profit	7,239	6,890
United States [Member]
Segment Reporting Information [Line Items]
Revenue, Net	6,100	5,600
Segment Reporting Information Net Sales [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	7,023	6,588
Segment Reporting Information Net Sales [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	2,841	2,845
Segment Reporting Information Net Sales [Member] | Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Revenue, Net	2,012	1,823
Segment Reporting Information Gross Margin [Member]
Segment Reporting Information [Line Items]
Gross Profit	7,442	7,022
Segment Reporting Information Gross Margin [Member] | Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(203)	(132)
Segment Reporting Information Gross Margin [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Gross Profit	4,468	4,160
Segment Reporting Information Gross Margin [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Gross Profit	1,798	1,754
Segment Reporting Information Gross Margin [Member] | Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Gross Profit	$ 1,176	$ 1,108

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Segment Information And Major Customers (Net Sales For Groups Of Similar Products And Services) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 11,876	$ 11,256
Service [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,579	2,304
Sales Revenue, Product Line [Member] | Switching [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	3,616	3,687
Sales Revenue, Product Line [Member] | Next Generation Networks [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,052	2,094
Sales Revenue, Product Line [Member] | Service Provider Video [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,148	883
Sales Revenue, Product Line [Member] | Collaboration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,020	1,108
Sales Revenue, Product Line [Member] | Wireless [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	486	353
Sales Revenue, Product Line [Member] | Data Center [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	417	259
Sales Revenue, Product Line [Member] | Security [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	338	319
Sales Revenue, Product Line [Member] | Other Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	220	249
Sales Revenue, Product Line [Member] | Product [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 9,297	$ 8,952

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Segment Information And Major Customers (Property And Equipment, Net) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 3,409	$ 3,402
International [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	608	560
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,801	$ 2,842

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Net Income Per Share (Calculation Of Basic And Diluted Net Income Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Earnings Per Share [Abstract]
Net income	$ 2,092	$ 1,777
Weighted-average shares-basic	5,301	5,394
Effect of dilutive potential common shares	33	13
Weighted-average shares-diluted	5,334	5,407
Net income per share-basic	$ 0.39	$ 0.33
Net income per share-diluted	$ 0.39	$ 0.33
Antidilutive employee share-based awards, excluded	438	679

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