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Document and Entity Information	6 Months Ended
Feb. 15, 2015	Mar. 04, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Feb 15, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	COST
Entity Registrant Name	COSTCO WHOLESALE CORP /NEW
Entity Central Index Key	0000909832
Current Fiscal Year End Date	--08-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		439,974,264

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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Feb. 15, 2015	Aug. 31, 2014
CURRENT ASSETS
Cash and cash equivalents	$ 5,866	$ 5,738
Short-term investments	1,587	1,577
Receivables, net	1,287	1,148
Merchandise inventories	8,558	8,456
Deferred income taxes and other current assets	760	669
Total current assets	18,058	17,588
PROPERTY AND EQUIPMENT
Land	4,907	4,716
Buildings and improvements	12,354	12,522
Equipment and fixtures	5,016	4,845
Construction in progress	607	592
Gross property and equipment	22,884	22,675
Less accumulated depreciation and amortization	(8,012)	(7,845)
Net property and equipment	14,872	14,830
OTHER ASSETS	670	606
TOTAL ASSETS	33,600	33,024
CURRENT LIABILITIES
Accounts payable	8,302	8,491
Accrued salaries and benefits	2,391	2,231
Accrued member rewards	800	773
Accrued sales and other taxes	433	442
Deferred membership fees	1,318	1,254
Current portion long term debt	1,200	0
Other current liabilities	3,805	1,221
Total current liabilities	18,249	14,412
LONG-TERM DEBT, excluding current portion	3,830	5,093
DEFERRED INCOME TAXES AND OTHER LIABILITIES	1,096	1,004
Total liabilities	23,175	20,509
COMMITMENTS AND CONTINGENCIES
EQUITY
Preferred stock $.005 par value; 100,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock $.005 par value; 900,000,000 shares authorized; 440,178,000 and 437,683,000 shares issued and outstanding	2	2
Additional paid-in capital	5,064	4,919
Accumulated other comprehensive loss	(797)	(76)
Retained earnings	5,937	7,458
Total Costco stockholders' equity	10,206	12,303
Noncontrolling interests	219	212
Total equity	10,425	12,515
TOTAL LIABILITIES AND EQUITY	$ 33,600	$ 33,024

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Feb. 15, 2015	Aug. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.005	$ 0.005
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized	900,000,000	900,000,000
Common stock, shares issued	440,178,000	437,683,000
Common stock, shares outstanding	440,178,000	437,683,000

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Condensed Consolidated Statements Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Document Period End Date			Feb 15, 2015
REVENUE
Net sales	$ 26,872	$ 25,756	$ 53,156	$ 50,224
Membership fees	582	550	1,164	1,099
Total revenue	27,454	26,306	54,320	51,323
OPERATING EXPENSES
Merchandise costs	23,897	23,043	47,282	44,867
Selling, general and administrative	2,671	2,531	5,367	5,032
Preopening expenses	9	8	24	32
Operating income	877	724	1,647	1,392
OTHER INCOME (EXPENSE)
Interest expense	(27)	(26)	(53)	(53)
Interest income and other, net	20	30	55	48
INCOME BEFORE INCOME TAXES	870	728	1,649	1,387
Provision for income taxes	263	255	537	483
Net income including noncontrolling interests	607	473	1,112	904
Net income attributable to noncontrolling interests	(9)	(10)	(18)	(16)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 598	$ 463	$ 1,094	$ 888
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 1.36	$ 1.05	$ 2.49	$ 2.02
Diluted (in dollars per share)	$ 1.35	$ 1.05	$ 2.47	$ 2.01
Cash Dividends Declared Per Common Share	$ 5.355	$ 0.31	$ 5.71	$ 0.62
Shares used in calculation (000's)
Basic (shares)	440,384	439,776	439,567	438,868
Diluted (shares)	442,896	442,829	442,522	442,627

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Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME INCLUDING NONCONTROLLING INTERESTS	$ 607	$ 473	$ 1,112	$ 904
Foreign-currency translation adjustment and other, net	(410)	(120)	(732)	(36)
Comprehensive income	197	353	380	868
Less: Comprehensive income attributable to noncontrolling interests	8	6	7	15
COMPREHENSIVE INCOME ATTRIBUTABLE TO COSTCO	$ 189	$ 347	$ 373	$ 853

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Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 15, 2015	Feb. 16, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income including noncontrolling interests	$ 607	$ 1,112	$ 904
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization	260	514	471
Stock-based compensation	86	236	185
Excess tax benefits on stock-based awards		(72)	(69)
Other non-cash operating activities, net		(17)	2
Changes in operating assets and liabilities:
Increase in merchandise inventories		(395)	(397)
Increase/(decrease) in accounts payable		237	(57)
Other operating assets and liabilities, net		413	613
Net cash provided by operating activities		2,028	1,652
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments		(657)	(1,365)
Maturities and sales of short-term investments		637	1,496
Additions to property and equipment	(612)	(1,167)	(1,021)
Other investing activities, net		7	(1)
Net cash used in investing activities		(1,180)	(891)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in bank checks outstanding		(115)	(43)
Proceeds from short-term borrowings		53	39
Proceeds from exercise of stock options		23	11
Minimum tax withholdings on stock-based awards		(177)	(163)
Excess tax benefits on stock-based awards		72	69
Repurchases of common stock		(102)	0
Cash dividend payments	(2,358)	(156)	(137)
Other financing activities, net		29	0
Net cash used in financing activities		(373)	(224)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		(347)	(51)
Net increase in cash and cash equivalents		128	486
CASH AND CASH EQUIVALENTS BEGINNING OF YEAR		5,738	4,644
CASH AND CASH EQUIVALENTS END OF PERIOD	5,866	5,866	5,130
Cash paid during the first half of year for:
Interest (reduced by $5 and $4 interest capitalized in 2015 and 2014, respectively)		56	53
Income taxes, net		432	211
SUPPLEMENTAL DISCLOSURE OF NON-CASH FINANCING ACTIVITIES:
Cash dividend declared, but not yet paid	$ 2,358	$ 2,358	$ 136

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Condensed Consolidated Statements Of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014
Statement of Cash Flows [Abstract]
Interest, interest capitalized	$ 5	$ 4

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Summary of Significant Accounting Policies	6 Months Ended
Feb. 15, 2015
Accounting Policies [Abstract]
Summary of Significant Policies	Note 1—Summary of Significant Accounting Policies Description of Business Costco Wholesale Corporation (Costco or the Company), a Washington corporation, and its subsidiaries operate membership warehouses based on the concept that offering members low prices on a limited selection of nationally branded and select private-label products in a wide range of merchandise categories will produce high sales volumes and rapid inventory turnover. At February 15, 2015, Costco operated 671 warehouses worldwide: 474 United States (U.S.) locations (in 43 states, Washington, D.C., and Puerto Rico), 88 Canada locations, 34 Mexico locations, 26 United Kingdom (U.K.) locations, 20 Japan locations, 11 Korea locations, 10 Taiwan locations, 7 Australia locations and 1 Spain location. The Company's online business operates websites in the U.S., Canada, U.K., and Mexico. Basis of Presentation The condensed consolidated financial statements include the accounts of Costco, its wholly-owned subsidiaries, and subsidiaries in which it has a controlling interest. The Company reports noncontrolling interests in consolidated entities as a component of equity separate from the Company’s equity. All material inter-company transactions between and among the Company and its consolidated subsidiaries and other consolidated entities have been eliminated in consolidation. The Company’s net income excludes income attributable to noncontrolling interests in Taiwan and Korea. Unless otherwise noted, references to net income relate to net income attributable to Costco. These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q for interim financial reporting pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Therefore, the interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company's annual report filed on Form 10-K for the fiscal year ended August 31, 2014. Fiscal Year End The Company operates on a 52/53 week fiscal year basis, with the fiscal year ending on the Sunday closest to August 31. References to the second quarters of 2015 and 2014 relate to the 12-week fiscal quarters ended February 15, 2015, and February 16, 2014, respectively. References to the first half of 2015 and 2014 relate to the twenty-four weeks ended February 15, 2015, and February 16, 2014, respectively. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions. Fair Value of Financial Instruments The Company accounts for certain assets and liabilities at fair value. The carrying value of the Company’s financial instruments, including cash and cash equivalents, receivables and accounts payable, approximate fair value due to their short-term nature or variable interest rates. See Notes 2, 3, and 4 for the carrying value and fair value of the Company’s investments, derivative instruments, and fixed-rate debt, respectively. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying a fair value hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs are: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Significant unobservable inputs that are not corroborated by market data. The Company’s current financial liabilities have fair values that approximate their carrying values. The Company’s long-term financial liabilities consist of long-term debt, which is recorded on the balance sheet at issuance price and adjusted for any applicable unamortized discounts or premiums. There have been no material changes to the valuation techniques utilized in the fair value measurement of assets and liabilities as disclosed in the Company's 2014 Form 10-K. Merchandise Inventories Merchandise inventories are valued at the lower of cost or market, as determined primarily by the retail inventory method, and are stated using the last-in, first-out (LIFO) method for substantially all U.S. merchandise inventories. Merchandise inventories for all foreign operations are primarily valued by the retail inventory method and are stated using the first-in, first-out (FIFO) method. The Company believes the LIFO method more fairly presents the results of operations by more closely matching current costs with current revenues. The Company records an adjustment each quarter, if necessary, for the projected annual effect of inflation or deflation, and these estimates are adjusted to actual results determined at year-end, after actual inflation rates and inventory levels for the year have been determined. At February 15, 2015, and August 31, 2014, the cumulative impact of the LIFO valuation on merchandise inventories was $103 and $109, respectively. Derivatives The Company is exposed to foreign-currency exchange-rate fluctuations in the normal course of business. It manages these fluctuations, in part, through the use of forward foreign-exchange contracts, seeking to economically hedge the impact of fluctuations of foreign exchange on known future expenditures denominated in a non-functional foreign-currency. The contracts relate primarily to U.S. dollar merchandise inventory expenditures made by the Company’s international subsidiaries, whose functional currency is not the U.S. dollar. Currently, these contracts do not qualify for derivative hedge accounting. The Company seeks to mitigate risk with the use of these contracts and does not intend to engage in speculative transactions. These contracts do not contain any credit-risk-related contingent features. The aggregate notional amounts of open, unsettled forward foreign-exchange contracts were $1,108 and $585 at February 15, 2015, and August 31, 2014, respectively. During the quarter and subsequent to quarter end, the Company repatriated a portion of the earnings in its Canadian operations to the U.S. To minimize the impact of fluctuations of the Canadian dollar upon transfer of the funds, the Company entered into approximately $350 in forward foreign-exchange contracts prior to quarter end. While the Company seeks to manage counterparty risk associated with these contracts by limiting transactions to counterparties with which the Company has an established banking relationship, there can be no assurance that this practice is effective. The contracts are limited to less than one year in duration. See Note 3 for information on the fair value of unsettled forward foreign-exchange contracts as of February 15, 2015, and August 31, 2014. The unrealized gains or losses recognized in interest income and other, net in the accompanying condensed consolidated statements of income relating to the net changes in the fair value of unsettled forward foreign-exchange contracts was a net loss of $12 for the second quarter and a net gain of $11 for first half of 2015, respectively, and immaterial for the second quarter and first half of 2014. The Company is exposed to fluctuations in prices for the energy it consumes, particularly electricity and natural gas, which it seeks to partially mitigate through the use of fixed-price contracts for certain of its warehouses and other facilities, primarily in the U.S. and Canada. The Company also enters into variable-priced contracts for some purchases of natural gas, in addition to fuel for its gas stations, on an index basis. These contracts meet the characteristics of derivative instruments, but generally qualify for the “normal purchases or normal sales” exception under authoritative guidance and thus require no mark-to-market adjustment. Foreign Currency The Company recognizes foreign-currency transaction gains and losses related to revaluing or settling monetary assets and liabilities denominated in currencies other than the functional currency in interest income and other, net in the accompanying condensed consolidated statements of income. Generally, this includes the U.S. dollar cash and cash equivalents and the U.S. dollar payables of consolidated subsidiaries revalued to their functional currency. Also included are realized foreign-currency gains or losses from settlements of forward foreign-exchange contracts. These items resulted in a net gain of $14 and $12 in the second quarter and first half of 2015, respectively, as compared to a net gain of $10 and $19 in the second quarter and first half of 2014, respectively. Stock Repurchase Programs Repurchased shares of common stock are retired, in accordance with the Washington Business Corporation Act. The par value of repurchased shares is deducted from common stock and the excess repurchase price over par value is deducted by allocation to both additional paid-in capital and retained earnings. The amount allocated to additional paid-in capital is calculated as the current value of additional paid-in capital per share outstanding and is applied to the number of shares repurchased. Any remaining amount is allocated to retained earnings. See Note 5 for additional information. Recent Accounting Pronouncements Not Yet Adopted In April 2014, the Financial Accounting Standards Board (FASB) issued guidance that changed the criteria for reporting discontinued operations, as well as requiring new disclosures about discontinued operations and disposals of components of an entity that do not qualify for discontinued operations reporting. This guidance is effective for fiscal years beginning after December 15, 2014, with early adoption permitted for disposals that have not been reported in financial statements previously issued. The Company will adopt this guidance at the beginning of fiscal year 2016. Adoption is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In May 2014, the FASB issued a new standard on the recognition of revenue from contracts with customers. The guidance changed the criteria for reporting revenue, as well as requiring disclosures sufficient to describe the nature, amount, timing, and uncertainty of revenue and cash flows arising from these contracts. Companies can transition to the standard either retrospectively or as a cumulative effect adjustment as of the date of adoption. The new standard is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company plans to adopt this guidance at the beginning of its first quarter of fiscal year 2018. The Company is evaluating the impact of this standard on its consolidated financial statements and disclosures.

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Investments	6 Months Ended
Feb. 15, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	Note 2—Investments The Company's major categories of investments have not materially changed from the annual reporting period ended August 31, 2014. The Company’s investments were as follows:   February 15, 2015: Cost Basis   Unrealized Gains, Net   Recorded Basis Available-for-sale:           Government and agency securities $ 1,553   $ 3   $ 1,556 Asset and mortgage-backed securities 4   0   4 Total available-for-sale 1,557   3   1,560 Held-to-maturity:           Certificates of deposit 27       27 Total short-term investments $ 1,584   $ 3   $ 1,587 August 31, 2014: Cost Basis   Unrealized Gains, Net   Recorded Basis Available-for-sale:           Government and agency securities $ 1,404   $ 1   $ 1,405 Asset and mortgage-backed securities 4   0   4 Total available-for-sale 1,408   1   1,409 Held-to-maturity:           Certificates of deposit 155       155 Bankers' acceptances 13       13 Total held-to-maturity 168       168 Total short-term investments $ 1,576   $ 1   $ 1,577 At February 15, 2015, and August 31, 2014, available-for-sale securities that were in continuous unrealized-loss positions were not material, and there were no unrealized gains and losses on cash and cash equivalents. The proceeds from sales of available-for-sale securities were $50 and $22 during the second quarter of 2015 and 2014, respectively. In the first half of 2015 and 2014, the proceeds from sales of available-for-sale securities were $67 and $32, respectively. Gross realized gains or losses from sales of available-for-sale securities during the second quarter and first half of 2015 and 2014 were not material. The maturities of available-for-sale and held-to-maturity securities at February 15, 2015, were as follows:   Available-For-Sale   Held-To-Maturity   Cost Basis   Fair Value   Due in one year or less $ 292   $ 292   $ 27 Due after one year through five years 1,193   1,194   0 Due after five years 72   74   0   $ 1,557   $ 1,560   $ 27

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Fair Value Measurement	6 Months Ended
Feb. 15, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 3—Fair Value Measurement Assets and Liabilities Measured at Fair Value on a Recurring Basis The tables below present information regarding the Company’s financial assets and financial liabilities that are measured at fair value on a recurring basis and indicate the level within the fair value hierarchy reflecting the valuation techniques utilized to determine fair value. February 15, 2015: Level 1   Level 2 Money market mutual funds(1) $ 145   $ 0 Investment in government and agency securities 0   1,556 Investment in asset and mortgage-backed securities 0   4 Forward foreign-exchange contracts, in asset position(2) 0   14 Forward foreign-exchange contracts, in (liability) position(2) 0   (3 ) Total $ 145   $ 1,571   August 31, 2014: Level 1   Level 2 Money market mutual funds(1) $ 312   $ 0 Investment in government and agency securities 0   1,405 Investment in asset and mortgage-backed securities 0   4 Forward foreign-exchange contracts, in asset position(2) 0   3 Forward foreign-exchange contracts, in (liability) position(2) 0   (3 ) Total $ 312   $ 1,409  _______________ (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. (2) The asset and the liability values are included in deferred income taxes and other current assets and other current liabilities, respectively, in the accompanying condensed consolidated balance sheets. See Note 1 for additional information on derivative instruments. The Company did not hold any Level 3 financial assets or liabilities that were measured at fair value on a recurring basis at February 15, 2015, or August 31, 2014. There were no financial assets or liabilities measured on a recurring basis using significant unobservable inputs (Level 3) and there were no transfers in or out of Level 1, 2, or 3 during the second quarter or first half of 2015 or 2014. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Financial assets measured at fair value on a nonrecurring basis include held-to-maturity investments that are carried at amortized cost and are not remeasured to fair value on a recurring basis. There were no fair value adjustments to these financial assets during the second quarter or first half of 2015 or 2014. Nonfinancial assets measured at fair value on a nonrecurring basis include items such as long-lived assets that are measured at fair value resulting from an impairment, if deemed necessary. There were no fair value adjustments to these nonfinancial assets and liabilities during the second quarter of 2015 and these adjustments were immaterial for the first half of 2015. Fair value adjustments to these nonfinancial assets and liabilities during the second quarter and first half of 2014 were immaterial.

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Debt	6 Months Ended
Feb. 15, 2015
Debt Disclosure [Abstract]
Debt	Note 4—Debt The estimated fair value of the Company’s debt was based primarily on reported market values, recently completed market transactions, and estimates based upon interest rates, maturities, and credit risk. Substantially all of the Company's long-term debt is valued using Level 2 inputs. The carrying and estimated fair values of the Company’s long-term debt consisted of the following:     February 15, 2015   August 31, 2014   Carrying Value   Fair Value   Carrying Value   Fair Value 0.65% Senior Notes due December 2015 $ 1,200   $ 1,203   $ 1,199   $ 1,203 5.5% Senior Notes due March 2017 1,099   1,201   1,099   1,223 1.125% Senior Notes due December 2017 1,100   1,102   1,100   1,095 1.7% Senior Notes due December 2019 1,198   1,194   1,198   1,186 Other long-term debt 433   443   497   510 Total long-term debt 5,030   5,143   5,093   5,217 Less current portion 1,200   1,203   0   0 Long-term debt, excluding current portion $ 3,830   $ 3,940   $ 5,093   $ 5,217 Subsequent to the end of the quarter, on February 17, 2015, the Company issued $1,000 in aggregate principal amount of Senior Notes (February 2015 Notes), as follows: $500 of 1.75% Senior Notes due February 15, 2020 and $500 of 2.25% Senior Notes due February 15, 2022. Interest is due semi-annually on February 15 and August 15, with the first payment due on August 15, 2015. The Company, at its option, may redeem the February 2015 Notes at any time, in whole or in part, at the redemption price plus accrued and unpaid interest to the date of redemption. The redemption price is equal to the greater of 100% of the principal amount of the notes to be redeemed or the sum of the present value of the remaining scheduled payments of principal and interest to maturity. The Company will be required to offer to purchase the February 2015 Notes at a price of 101% of the principal amount plus accrued and unpaid interest to the date of repurchase, upon certain events as defined by the terms of the February 2015 Notes. The discount and issuance costs associated with the February 2015 Notes will be amortized to interest expense over the term of the notes, which are valued using Level 2 inputs.

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Equity and Comprehensive Income	6 Months Ended
Feb. 15, 2015
Equity [Abstract]
Equity and Comprehensive Income	Note 5—Equity and Comprehensive Income Dividends The Company’s current quarterly dividend rate is $0.355 per share, compared to $0.31 per share in the second quarter of 2014. On January 29, 2015, the Board of Directors declared a quarterly cash dividend in the amount of $0.355 per share and a special cash dividend of $5.00 per share, both of which were paid on February 27, 2015. The aggregate payment was approximately $2,358 and was included in other current liabilities in the accompanying condensed consolidated balance sheets at February 15, 2015. Stock Repurchase Programs In the second quarter and first half of 2015, the Company repurchased 642,000 and 781,000 shares, at an average price of $143.21 and $140.23, totaling $92 and $110, respectively. The remaining amount available for stock repurchases under our approved plan, which expires in April 2015, was $2,611 at February 15, 2015. There was no stock repurchase activity in the second quarter and first half of 2014. These amounts may differ from the stock repurchase balances in the condensed consolidated statements of cash flows due to changes in unsettled stock repurchases at the end of a quarter. Purchases are made from time-to-time, as conditions warrant, in the open market or in block purchases, and pursuant to plans under SEC Rule 10b5-1. Components of Equity and Comprehensive Income The following tables show the changes in equity attributable to Costco and the noncontrolling interests of consolidated subsidiaries:   Attributable to Costco   Noncontrolling Interests   Total Equity Equity at August 31, 2014 $ 12,303   $ 212   $ 12,515 Comprehensive income:           Net income 1,094   18   1,112 Foreign-currency translation adjustment and other, net (721 )   (11 )   (732 ) Comprehensive income 373   7   380 Stock-based compensation 236   0   236 Stock options exercised, including tax effects 39   0   39 Release of vested restricted stock units (RSUs), including tax effects (121 )   0   (121 ) Repurchases of common stock (110 )   0   (110 ) Cash dividends declared (2,514 )   0   (2,514 ) Equity at February 15, 2015 $ 10,206   $ 219   $ 10,425   Attributable to Costco   Noncontrolling Interests   Total Equity Equity at September 1, 2013 $ 10,833   $ 179   $ 11,012 Comprehensive income:           Net income 888   16   904 Foreign-currency translation adjustment and other, net (35 )   (1 )   (36 ) Comprehensive income 853   15   868 Stock-based compensation 185   0   185 Stock options exercised, including tax effects 18   0   18 Release of vested RSUs, including tax effects (101 )   0   (101 ) Cash dividends declared (273 )   0   (273 ) Equity at February 16, 2014 $ 11,515   $ 194   $ 11,709

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Stock-Based Compensation Plans	6 Months Ended
Feb. 15, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Note 6—Stock-Based Compensation In the second quarter of 2015, the Sixth Restated 2002 Stock Incentive Plan was amended following shareholder approval and is now referred to as the Seventh Restated 2002 Incentive Plan (Seventh Plan). The Seventh Plan authorized the issuance of 23,500,000 shares (13,429,000 RSUs) of common stock for future grants in addition to the shares authorized under the previous plan. The Company issues new shares of common stock upon exercise of stock options and upon vesting of RSUs. Shares for vested RSUs are generally delivered to participants annually, net of shares equal to the minimum statutory withholding taxes. As required by the Company’s Seventh Plan, in conjunction with the special cash dividend discussed in Note 5, adjustments were made to awards outstanding on the dividend record date to preserve their value following the special cash dividend, as follows: (i) the number of shares subject to outstanding RSUs was increased; and (ii) the exercise prices of outstanding stock options were reduced and the number of shares subject to such options was increased. The number of outstanding stock options and RSUs was increased by multiplying the number of outstanding shares by a factor of 1.0429, representing the ratio of the NASDAQ closing price of $155.92 on February 4, 2015, which was the last trading day immediately prior to the ex-dividend date, to the NASDAQ opening price of $149.50 on the ex-dividend date, February 5, 2015. The exercise prices of stock options were reduced by multiplying the prices by a factor of 0.9589, representing the ratio of the NASDAQ opening price on the ex-dividend date to the NASDAQ closing price on February 4. Approximately 410,000 stock options were adjusted, and approximately 8,956,000 RSUs were adjusted. These adjustments did not result in additional share-based compensation expense, as the fair value of the outstanding awards immediately following the payment of the special cash dividend was equal to the fair value immediately prior to such distribution. As further required by the Seventh Plan, the maximum number of shares issuable under the Seventh Plan was proportionally adjusted based on the 1.0429 ratio. This resulted in an additional 750,000 RSU shares available to be granted. Summary of Restricted Stock Unit Activity At February 15, 2015, 18,242,000 shares were available to be granted as RSUs and the following awards were outstanding: • 8,786,000 time-based RSUs, which vest upon continued employment over specified periods of time; • 265,000 performance-based RSUs granted to certain executive officers of the Company for which the performance targets have been met. Further restrictions lapse upon achievement of continued employment over specified periods of time; and • 281,000 performance-based RSUs to be granted to executive officers of the Company upon achievement of performance targets for fiscal 2015, as determined by the Compensation Committee of the Board of Directors after the end of the fiscal year. These awards are included in the table below and the Company recognized compensation expense for these awards as it is currently deemed probable that the targets will be achieved. The following table summarizes RSU transactions during the first half of 2015:   Number of Units (in 000’s)   Weighted-Average Grant Date Fair Value Outstanding at August 31, 2014 9,117   $ 86.92 Granted 4,017   125.68 Vested and delivered (4,070 )   87.26 Forfeited (108 )   105.29 Special cash dividend 376   N/A Outstanding at February 15, 2015 9,332   $ 99.69 The remaining unrecognized compensation cost related to non-vested RSUs at February 15, 2015 was $808, and the weighted-average period over which this cost will be recognized is 1.8 years. Summary of Stock-Based Compensation The following table summarizes stock-based compensation expense and the related tax benefits under the Company’s plans:   12 Weeks Ended   24 Weeks Ended   February 15, 2015   February 16, 2014   February 15, 2015   February 16, 2014 Stock-based compensation expense before income taxes $ 86   $ 73   $ 236   $ 185 Less recognized income tax benefit (29 )   (24 )   (80 )   (62 ) Stock-based compensation expense, net of income taxes $ 57   $ 49   $ 156   $ 123

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Income Taxes Income Taxes	6 Months Ended
Feb. 15, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 7—Income Taxes The Company’s reported effective income tax rates for the second quarter and first half of 2015 were 30.2% and 32.6%, respectively, compared to 35.0% and 34.8% for second quarter and first half of 2014, respectively, which includes the net impact of discrete tax items. The provision for income taxes in the second quarter and first half of 2015 was favorably impacted by discrete net tax benefits of $45 and $44, respectively, primarily due to a $57 tax benefit recorded in the second quarter of 2015 in connection with the special cash dividend payable to employees, who through the Company's 401(k) Retirement Plan owned 29,000,000 shares of Company common stock through an Employee Stock Ownership Plan. Dividends on these shares are deductible for U.S. income tax purposes. The provision was negatively impacted by a $14 tax charge in the second quarter of 2015 related to an ongoing income tax matter.

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Net Income per Common and Common Equivalent Share	6 Months Ended
Feb. 15, 2015
Earnings Per Share [Abstract]
Net Income Per Common and Common Equivalent Share	Note 8—Net Income per Common and Common Equivalent Share The following table shows the amounts used in computing net income per share and the effect on net income and the weighted average number of shares of potentially dilutive common shares outstanding (shares in 000’s):   12 Weeks Ended   24 Weeks Ended   February 15, 2015   February 16, 2014    February 15, 2015   February 16, 2014 Net income available to common stockholders after assumed conversions of dilutive securities $ 598   $ 463    $ 1,094   $ 888 Weighted average number of common shares used in basic net income per common share 440,384   439,776    439,567   438,868 RSUs and stock options 2,500   3,025    2,943   3,730 Conversion of convertible notes 12   28    12   29 Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share 442,896   442,829    442,522   442,627

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Commitments and Contingencies	6 Months Ended
Feb. 15, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 9—Commitments and Contingencies Legal Proceedings The Company is involved in a number of claims, proceedings and litigation arising from its business and property ownership. In accordance with applicable accounting guidance, the Company establishes an accrual for legal proceedings if and when those matters reach a stage where they present loss contingencies that are both probable and reasonably estimable. There may be exposure to loss in excess of any amounts accrued. The Company monitors those matters for developments that would affect the likelihood of a loss and the accrued amount, if any, thereof, and adjusts the amount as appropriate. As of the end of the quarter, the Company has not recorded an accrual with respect to any matter described below. If the loss contingency at issue is not both probable and reasonably estimable, the Company does not establish an accrual, but will continue to monitor the matter for developments that will make the loss contingency both probable and reasonably estimable. In each case, there is a reasonable possibility that a loss may be incurred, including a loss in excess of the applicable accrual. For matters where no accrual has been recorded, the possible loss or range of loss (including any loss in excess of the accrual) cannot in our view be reasonably estimated because, among other things: (i) the remedies or penalties sought are indeterminate or unspecified; (ii) the legal and/or factual theories are not well developed; and/or (iii) the matters involve complex or novel legal theories or a large number of parties. The Company is a defendant in the following matters, among others: Numerous putative class actions have been brought around the United States against motor fuel retailers, including the Company, alleging that they have been overcharging consumers by selling gasoline or diesel that is warmer than 60 degrees without adjusting the volume sold to compensate for heat-related expansion or disclosing the effect of such expansion on the energy equivalent received by the consumer. The Company is named in the following actions: Raphael Sagalyn, et al., v. Chevron USA, Inc., et al., Case No. 07-430 (D. Md.); Phyllis Lerner, et al., v. Costco Wholesale Corporation, et al., Case No. 07-1216 (C.D. Cal.); Linda A. Williams, et al., v. BP Corporation North America, Inc., et al., Case No. 07-179 (M.D. Ala.); James Graham, et al. v. Chevron USA, Inc., et al., Civil Action No. 07-193 (E.D. Va.); Betty A. Delgado, et al., v. Allsups, Convenience Stores, Inc., et al., Case No. 07-202 (D.N.M.); Gary Kohut, et al. v. Chevron USA, Inc., et al., Case No. 07-285 (D. Nev.); Mark Rushing, et al., v. Alon USA, Inc., et al., Case No. 06-7621 (N.D. Cal.); James Vanderbilt, et al., v. BP Corporation North America, Inc., et al., Case No. 06-1052 (W.D. Mo.); Zachary Wilson, et al., v. Ampride, Inc., et al., Case No. 06-2582 (D.Kan.); Diane Foster, et al., v. BP North America Petroleum, Inc., et al., Case No. 07-02059 (W.D. Tenn.); Mara Redstone, et al., v. Chevron USA, Inc., et al., Case No. 07-20751 (S.D. Fla.); Fred Aguirre, et al. v. BP West Coast Products LLC, et al., Case No. 07-1534 (N.D. Cal.); J.C. Wash, et al., v. Chevron USA, Inc., et al.; Case No. 4:07cv37 (E.D. Mo.); Jonathan Charles Conlin, et al., v. Chevron USA, Inc., et al.; Case No. 07 0317 (M.D. Tenn.); William Barker, et al. v. Chevron USA, Inc., et al.; Case No. 07-cv-00293 (D.N.M.); Melissa J. Couch, et al. v. BP Products North America, Inc., et al., Case No. 07cv291 (E.D. Tex.); S. Garrett Cook, Jr., et al., v. Hess Corporation, et al., Case No. 07cv750 (M.D. Ala.); Jeff Jenkins, et al. v. Amoco Oil Company, et al., Case No. 07-cv-00661 (D. Utah); and Mark Wyatt, et al., v. B. P. America Corp., et al., Case No. 07-1754 (S.D. Cal.). On June 18, 2007, the Judicial Panel on Multidistrict Litigation assigned the action, entitled In re Motor Fuel Temperature Sales Practices Litigation, MDL Docket No 1840, to Judge Kathryn Vratil in the United States District Court for the District of Kansas. On April 12, 2009, the Company agreed to settle the actions in which it is named as a defendant. Under the settlement, which was subject to final approval by the court, the Company agreed, to the extent allowed by law and subject to other terms and conditions in the agreement, to install over five years from the effective date of the settlement temperature-correcting dispensers in the States of Alabama, Arizona, California, Florida, Georgia, Kentucky, Nevada, New Mexico, North Carolina, South Carolina, Tennessee, Texas, Utah, and Virginia. Other than payments to class representatives, the settlement does not provide for cash payments to class members. On September 22, 2011, the court preliminarily approved a revised settlement, which did not materially alter the terms. On April 24, 2012, the court granted final approval of the revised settlement. A class member who objected has filed a notice of appeal from the order approving the settlement. Plaintiffs have moved for an award of $10 in attorneys’ fees, as well as an award of costs and payments to class representatives. The Company has opposed the motion. On March 20, 2014, the Company filed a notice invoking a “most favored nation” provision under the settlement, under which it seeks to adopt provisions in later settlements with certain other defendants, an invocation that class counsel has opposed. The motion was denied on January 23, 2015. On October 4, 2006, the Company received a grand jury subpoena from the United States Attorney’s Office for the Central District of California, seeking records relating to the Company’s receipt and handling of hazardous merchandise returned by Costco members and other records. The Company has entered into a tolling agreement with the United States Attorney’s Office. The Company has received notices from most states stating that they have appointed an agent to conduct an examination of the books and records of the Company to determine whether it has complied with state unclaimed property laws. In addition to seeking the turnover of unclaimed property subject to escheat laws, the states may seek interest, penalties, costs of examinations, and other relief. Certain states have separately also made requests for payment by the Company concerning a specific type of property. The Company has received from the Drug Enforcement Administration subpoenas and administrative inspection warrants concerning the Company's fulfillment of prescriptions related to controlled substances and related practices. Offices of the United States Attorney in various districts have communicated to the Company their belief that the Company has committed civil regulatory violations concerning these subjects. The Company is seeking to cooperate with these processes. The Company does not believe that any pending claim, proceeding or litigation, either alone or in the aggregate, will have a material adverse effect on the Company’s financial position; however, it is possible that an unfavorable outcome of some or all of the matters, however unlikely, could result in a charge that might be material to the results of an individual fiscal quarter.

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Segment Reporting	6 Months Ended
Feb. 15, 2015
Segment Reporting [Abstract]
Segment Reporting	Note 10—Segment Reporting The Company and its subsidiaries are principally engaged in the operation of membership warehouses in the U.S., Canada, Mexico, U.K., Japan, Australia, and Spain and through majority-owned subsidiaries in Taiwan and Korea. Reportable segments are largely based on management’s organization of the operating segments for operational decisions and assessments of financial performance, which considers geographic locations. The material accounting policies of the segments are the same as described in the notes to the consolidated financial statements included in the Company's annual report filed on Form 10-K for the fiscal year ended August 31, 2014, and Note 1 above. All material inter-segment net sales and expenses have been eliminated in computing total revenue and operating income. Certain operating expenses, predominantly stock-based compensation, are incurred on behalf of the Company's Canadian and Other International Operations, but are included in the U.S. Operations because those costs are not allocated internally and generally come under the responsibility of the Company's U.S. management team.   United States Operations   Canadian Operations   Other International Operations   Total Twelve Weeks Ended February 15, 2015               Total revenue $ 19,879   $ 4,001   $ 3,574   $ 27,454 Operating income 556   178   143   877 Depreciation and amortization 193   30   37   260 Additions to property and equipment 327   32   253   612 Twelve Weeks Ended February 16, 2014               Total revenue $ 18,859   $ 4,056   $ 3,391   $ 26,306 Operating income 424   161   139   724 Depreciation and amortization 174   31   35   240 Additions to property and equipment 228   51   168   447 Twenty-four Weeks Ended February 15, 2015               Total revenue $ 39,060   $ 8,232   $ 7,028   $ 54,320 Operating income 989   374   284   1,647 Depreciation and amortization 381   58   75   514 Additions to property and equipment 763   78   326   1,167 Net property and equipment 10,403   1,457   3,012   14,872 Total assets 23,598   3,858   6,144   33,600 Twenty-four Weeks Ended February 16, 2014               Total revenue $ 36,583   $ 8,180   $ 6,560   $ 51,323 Operating income 788   350   254   1,392 Depreciation and amortization 344   59   68   471 Additions to property and equipment 613   118   290   1,021 Net property and equipment 9,891   1,612   2,845   14,348 Total assets 21,479   4,429   5,658   31,566 Year Ended August 31, 2014               Total revenue $ 80,477   $ 17,943   $ 14,220   $ 112,640 Operating income 1,880   796   544   3,220 Depreciation and amortization 755   124   150   1,029 Additions to property and equipment 1,245   204   544   1,993 Net property and equipment 10,132   1,662   3,036   14,830 Total assets 21,929   4,892   6,203   33,024

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Summary of Significant Accounting Policies (Policies)	6 Months Ended
Feb. 15, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements include the accounts of Costco, its wholly-owned subsidiaries, and subsidiaries in which it has a controlling interest. The Company reports noncontrolling interests in consolidated entities as a component of equity separate from the Company’s equity. All material inter-company transactions between and among the Company and its consolidated subsidiaries and other consolidated entities have been eliminated in consolidation. The Company’s net income excludes income attributable to noncontrolling interests in Taiwan and Korea. Unless otherwise noted, references to net income relate to net income attributable to Costco. These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q for interim financial reporting pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Therefore, the interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company's annual report filed on Form 10-K for the fiscal year ended August 31, 2014.
Fiscal Year End	Fiscal Year End The Company operates on a 52/53 week fiscal year basis, with the fiscal year ending on the Sunday closest to August 31. References to the second quarters of 2015 and 2014 relate to the 12-week fiscal quarters ended February 15, 2015, and February 16, 2014, respectively.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company accounts for certain assets and liabilities at fair value. The carrying value of the Company’s financial instruments, including cash and cash equivalents, receivables and accounts payable, approximate fair value due to their short-term nature or variable interest rates. See Notes 2, 3, and 4 for the carrying value and fair value of the Company’s investments, derivative instruments, and fixed-rate debt, respectively. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying a fair value hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs are: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Significant unobservable inputs that are not corroborated by market data. The Company’s current financial liabilities have fair values that approximate their carrying values. The Company’s long-term financial liabilities consist of long-term debt, which is recorded on the balance sheet at issuance price and adjusted for any applicable unamortized discounts or premiums. There have been no material changes to the valuation techniques utilized in the fair value measurement of assets and liabilities as disclosed in the Company's 2014 Form 10-K.
Merchandise Inventories	Merchandise Inventories Merchandise inventories are valued at the lower of cost or market, as determined primarily by the retail inventory method, and are stated using the last-in, first-out (LIFO) method for substantially all U.S. merchandise inventories. Merchandise inventories for all foreign operations are primarily valued by the retail inventory method and are stated using the first-in, first-out (FIFO) method. The Company believes the LIFO method more fairly presents the results of operations by more closely matching current costs with current revenues. The Company records an adjustment each quarter, if necessary, for the projected annual effect of inflation or deflation, and these estimates are adjusted to actual results determined at year-end, after actual inflation rates and inventory levels for the year have been determined. At February 15, 2015, and August 31, 2014, the cumulative impact of the LIFO valuation on merchandise inventories was $103 and $109, respectively.
Derivatives	Derivatives The Company is exposed to foreign-currency exchange-rate fluctuations in the normal course of business. It manages these fluctuations, in part, through the use of forward foreign-exchange contracts, seeking to economically hedge the impact of fluctuations of foreign exchange on known future expenditures denominated in a non-functional foreign-currency. The contracts relate primarily to U.S. dollar merchandise inventory expenditures made by the Company’s international subsidiaries, whose functional currency is not the U.S. dollar. Currently, these contracts do not qualify for derivative hedge accounting. The Company seeks to mitigate risk with the use of these contracts and does not intend to engage in speculative transactions. These contracts do not contain any credit-risk-related contingent features. The aggregate notional amounts of open, unsettled forward foreign-exchange contracts were $1,108 and $585 at February 15, 2015, and August 31, 2014, respectively. During the quarter and subsequent to quarter end, the Company repatriated a portion of the earnings in its Canadian operations to the U.S. To minimize the impact of fluctuations of the Canadian dollar upon transfer of the funds, the Company entered into approximately $350 in forward foreign-exchange contracts prior to quarter end. While the Company seeks to manage counterparty risk associated with these contracts by limiting transactions to counterparties with which the Company has an established banking relationship, there can be no assurance that this practice is effective. The contracts are limited to less than one year in duration. See Note 3 for information on the fair value of unsettled forward foreign-exchange contracts as of February 15, 2015, and August 31, 2014. The unrealized gains or losses recognized in interest income and other, net in the accompanying condensed consolidated statements of income relating to the net changes in the fair value of unsettled forward foreign-exchange contracts was a net loss of $12 for the second quarter and a net gain of $11 for first half of 2015, respectively, and immaterial for the second quarter and first half of 2014. The Company is exposed to fluctuations in prices for the energy it consumes, particularly electricity and natural gas, which it seeks to partially mitigate through the use of fixed-price contracts for certain of its warehouses and other facilities, primarily in the U.S. and Canada. The Company also enters into variable-priced contracts for some purchases of natural gas, in addition to fuel for its gas stations, on an index basis. These contracts meet the characteristics of derivative instruments, but generally qualify for the “normal purchases or normal sales” exception under authoritative guidance and thus require no mark-to-market adjustment.
Foreign Currency	Foreign Currency The Company recognizes foreign-currency transaction gains and losses related to revaluing or settling monetary assets and liabilities denominated in currencies other than the functional currency in interest income and other, net in the accompanying condensed consolidated statements of income. Generally, this includes the U.S. dollar cash and cash equivalents and the U.S. dollar payables of consolidated subsidiaries revalued to their functional currency. Also included are realized foreign-currency gains or losses from settlements of forward foreign-exchange contracts. These items resulted in a net gain of $14 and $12 in the second quarter and first half of 2015, respectively, as compared to a net gain of $10 and $19 in the second quarter and first half of 2014, respectively.
Stock Repurchase Programs	Stock Repurchase Programs Repurchased shares of common stock are retired, in accordance with the Washington Business Corporation Act. The par value of repurchased shares is deducted from common stock and the excess repurchase price over par value is deducted by allocation to both additional paid-in capital and retained earnings. The amount allocated to additional paid-in capital is calculated as the current value of additional paid-in capital per share outstanding and is applied to the number of shares repurchased. Any remaining amount is allocated to retained earnings. See Note 5 for additional information.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In April 2014, the Financial Accounting Standards Board (FASB) issued guidance that changed the criteria for reporting discontinued operations, as well as requiring new disclosures about discontinued operations and disposals of components of an entity that do not qualify for discontinued operations reporting. This guidance is effective for fiscal years beginning after December 15, 2014, with early adoption permitted for disposals that have not been reported in financial statements previously issued. The Company will adopt this guidance at the beginning of fiscal year 2016. Adoption is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In May 2014, the FASB issued a new standard on the recognition of revenue from contracts with customers. The guidance changed the criteria for reporting revenue, as well as requiring disclosures sufficient to describe the nature, amount, timing, and uncertainty of revenue and cash flows arising from these contracts. Companies can transition to the standard either retrospectively or as a cumulative effect adjustment as of the date of adoption. The new standard is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company plans to adopt this guidance at the beginning of its first quarter of fiscal year 2018. The Company is evaluating the impact of this standard on its consolidated financial statements and disclosures.

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Investments (Tables)	6 Months Ended
Feb. 15, 2015
Investments, Debt and Equity Securities [Abstract]
Available for Sale and Held to Maturity Investments	The Company’s investments were as follows:   February 15, 2015: Cost Basis   Unrealized Gains, Net   Recorded Basis Available-for-sale:           Government and agency securities $ 1,553   $ 3   $ 1,556 Asset and mortgage-backed securities 4   0   4 Total available-for-sale 1,557   3   1,560 Held-to-maturity:           Certificates of deposit 27       27 Total short-term investments $ 1,584   $ 3   $ 1,587 August 31, 2014: Cost Basis   Unrealized Gains, Net   Recorded Basis Available-for-sale:           Government and agency securities $ 1,404   $ 1   $ 1,405 Asset and mortgage-backed securities 4   0   4 Total available-for-sale 1,408   1   1,409 Held-to-maturity:           Certificates of deposit 155       155 Bankers' acceptances 13       13 Total held-to-maturity 168       168 Total short-term investments $ 1,576   $ 1   $ 1,577
Maturities of Available for Sale and Held to Maturity Securities	The maturities of available-for-sale and held-to-maturity securities at February 15, 2015, were as follows:   Available-For-Sale   Held-To-Maturity   Cost Basis   Fair Value   Due in one year or less $ 292   $ 292   $ 27 Due after one year through five years 1,193   1,194   0 Due after five years 72   74   0   $ 1,557   $ 1,560   $ 27

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Fair Value Measurement (Tables)	6 Months Ended
Feb. 15, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The tables below present information regarding the Company’s financial assets and financial liabilities that are measured at fair value on a recurring basis and indicate the level within the fair value hierarchy reflecting the valuation techniques utilized to determine fair value. February 15, 2015: Level 1   Level 2 Money market mutual funds(1) $ 145   $ 0 Investment in government and agency securities 0   1,556 Investment in asset and mortgage-backed securities 0   4 Forward foreign-exchange contracts, in asset position(2) 0   14 Forward foreign-exchange contracts, in (liability) position(2) 0   (3 ) Total $ 145   $ 1,571   August 31, 2014: Level 1   Level 2 Money market mutual funds(1) $ 312   $ 0 Investment in government and agency securities 0   1,405 Investment in asset and mortgage-backed securities 0   4 Forward foreign-exchange contracts, in asset position(2) 0   3 Forward foreign-exchange contracts, in (liability) position(2) 0   (3 ) Total $ 312   $ 1,409  _______________ (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. (2) The asset and the liability values are included in deferred income taxes and other current assets and other current liabilities, respectively, in the accompanying condensed consolidated balance sheets. See Note 1 for additional information on derivative instruments.

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Debt (Tables)	6 Months Ended
Feb. 15, 2015
Debt Disclosure [Abstract]
Carrying Value and Estimated Fair Value of Company's Long-Term Debt	The carrying and estimated fair values of the Company’s long-term debt consisted of the following:     February 15, 2015   August 31, 2014   Carrying Value   Fair Value   Carrying Value   Fair Value 0.65% Senior Notes due December 2015 $ 1,200   $ 1,203   $ 1,199   $ 1,203 5.5% Senior Notes due March 2017 1,099   1,201   1,099   1,223 1.125% Senior Notes due December 2017 1,100   1,102   1,100   1,095 1.7% Senior Notes due December 2019 1,198   1,194   1,198   1,186 Other long-term debt 433   443   497   510 Total long-term debt 5,030   5,143   5,093   5,217 Less current portion 1,200   1,203   0   0 Long-term debt, excluding current portion $ 3,830   $ 3,940   $ 5,093   $ 5,217

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Equity and Comprehensive Income (Tables)	6 Months Ended
Feb. 15, 2015
Equity [Abstract]
Components Of Equity And Comprehensive Income	The following tables show the changes in equity attributable to Costco and the noncontrolling interests of consolidated subsidiaries:   Attributable to Costco   Noncontrolling Interests   Total Equity Equity at August 31, 2014 $ 12,303   $ 212   $ 12,515 Comprehensive income:           Net income 1,094   18   1,112 Foreign-currency translation adjustment and other, net (721 )   (11 )   (732 ) Comprehensive income 373   7   380 Stock-based compensation 236   0   236 Stock options exercised, including tax effects 39   0   39 Release of vested restricted stock units (RSUs), including tax effects (121 )   0   (121 ) Repurchases of common stock (110 )   0   (110 ) Cash dividends declared (2,514 )   0   (2,514 ) Equity at February 15, 2015 $ 10,206   $ 219   $ 10,425   Attributable to Costco   Noncontrolling Interests   Total Equity Equity at September 1, 2013 $ 10,833   $ 179   $ 11,012 Comprehensive income:           Net income 888   16   904 Foreign-currency translation adjustment and other, net (35 )   (1 )   (36 ) Comprehensive income 853   15   868 Stock-based compensation 185   0   185 Stock options exercised, including tax effects 18   0   18 Release of vested RSUs, including tax effects (101 )   0   (101 ) Cash dividends declared (273 )   0   (273 ) Equity at February 16, 2014 $ 11,515   $ 194   $ 11,709

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Stock-Based Compensation Plans (Tables)	6 Months Ended
Feb. 15, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of RSU Transactions	The following table summarizes RSU transactions during the first half of 2015:   Number of Units (in 000’s)   Weighted-Average Grant Date Fair Value Outstanding at August 31, 2014 9,117   $ 86.92 Granted 4,017   125.68 Vested and delivered (4,070 )   87.26 Forfeited (108 )   105.29 Special cash dividend 376   N/A Outstanding at February 15, 2015 9,332   $ 99.69
Summary of Stock-Based Compensation Expense and Related Tax Benefits	The following table summarizes stock-based compensation expense and the related tax benefits under the Company’s plans:   12 Weeks Ended   24 Weeks Ended   February 15, 2015   February 16, 2014   February 15, 2015   February 16, 2014 Stock-based compensation expense before income taxes $ 86   $ 73   $ 236   $ 185 Less recognized income tax benefit (29 )   (24 )   (80 )   (62 ) Stock-based compensation expense, net of income taxes $ 57   $ 49   $ 156   $ 123

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Net Income per Common and Common Equivalent Share (Tables)	6 Months Ended
Feb. 15, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table shows the amounts used in computing net income per share and the effect on net income and the weighted average number of shares of potentially dilutive common shares outstanding (shares in 000’s):   12 Weeks Ended   24 Weeks Ended   February 15, 2015   February 16, 2014    February 15, 2015   February 16, 2014 Net income available to common stockholders after assumed conversions of dilutive securities $ 598   $ 463    $ 1,094   $ 888 Weighted average number of common shares used in basic net income per common share 440,384   439,776    439,567   438,868 RSUs and stock options 2,500   3,025    2,943   3,730 Conversion of convertible notes 12   28    12   29 Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share 442,896   442,829    442,522   442,627

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Segment Reporting (Tables)	6 Months Ended
Feb. 15, 2015
Segment Reporting [Abstract]
Segment Reporting Information, by Segment	Certain operating expenses, predominantly stock-based compensation, are incurred on behalf of the Company's Canadian and Other International Operations, but are included in the U.S. Operations because those costs are not allocated internally and generally come under the responsibility of the Company's U.S. management team.   United States Operations   Canadian Operations   Other International Operations   Total Twelve Weeks Ended February 15, 2015               Total revenue $ 19,879   $ 4,001   $ 3,574   $ 27,454 Operating income 556   178   143   877 Depreciation and amortization 193   30   37   260 Additions to property and equipment 327   32   253   612 Twelve Weeks Ended February 16, 2014               Total revenue $ 18,859   $ 4,056   $ 3,391   $ 26,306 Operating income 424   161   139   724 Depreciation and amortization 174   31   35   240 Additions to property and equipment 228   51   168   447 Twenty-four Weeks Ended February 15, 2015               Total revenue $ 39,060   $ 8,232   $ 7,028   $ 54,320 Operating income 989   374   284   1,647 Depreciation and amortization 381   58   75   514 Additions to property and equipment 763   78   326   1,167 Net property and equipment 10,403   1,457   3,012   14,872 Total assets 23,598   3,858   6,144   33,600 Twenty-four Weeks Ended February 16, 2014               Total revenue $ 36,583   $ 8,180   $ 6,560   $ 51,323 Operating income 788   350   254   1,392 Depreciation and amortization 344   59   68   471 Additions to property and equipment 613   118   290   1,021 Net property and equipment 9,891   1,612   2,845   14,348 Total assets 21,479   4,429   5,658   31,566 Year Ended August 31, 2014               Total revenue $ 80,477   $ 17,943   $ 14,220   $ 112,640 Operating income 1,880   796   544   3,220 Depreciation and amortization 755   124   150   1,029 Additions to property and equipment 1,245   204   544   1,993 Net property and equipment 10,132   1,662   3,036   14,830 Total assets 21,929   4,892   6,203   33,024

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015 warehouse	Feb. 16, 2014	Feb. 15, 2015 warehouse	Feb. 16, 2014	Aug. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (12)		$ 11
Foreign Currency Transaction Gain (Loss), before Tax	14	10	12	19
Number Of Warehouses Operated	671		671
Inventory LIFO reserve cumulative impact	103		103		109
Forward Foreign Exchange Contracts
Summary Of Significant Accounting Policies [Line Items]
Notional amount of forward foreign - exchange derivative	1,108		1,108		585
Forward Foreign Exchange Contracts
Summary Of Significant Accounting Policies [Line Items]
Notional amount of forward foreign - exchange derivative	$ 350		$ 350
UNITED STATES
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	474		474
Number of states in country	43		43
CANADA
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	88		88
MEXICO
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	34		34
UNITED KINGDOM
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	26		26
JAPAN
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	20		20
TAIWAN, PROVINCE OF CHINA
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	10		10
KOREA, REPUBLIC OF
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	11		11
AUSTRALIA
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	7		7
SPAIN
Summary Of Significant Accounting Policies [Line Items]
Number Of Warehouses Operated	1		1

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Investments - Available for Sale and Held to Maturity Investments (Detail) (USD $) In Millions, unless otherwise specified	Feb. 15, 2015	Aug. 31, 2014
Available For Sale And Held To Maturity [Line Items]
Available-For-Sale, Cost Basis	$ 1,557
Available-for-sale, Recorded Basis, Total	1,560
Held-to-maturity, Cost Basis	27
Total investments, Recorded Basis	1,587	1,577
Short-term Investments
Available For Sale And Held To Maturity [Line Items]
Unrealized gains	3	1
Total investments, Cost Basis	1,584	1,576
Total investments, Recorded Basis	1,587	1,577
Short-term Investments | Available-for-sale Securities
Available For Sale And Held To Maturity [Line Items]
Available-For-Sale, Cost Basis	1,557	1,408
Unrealized gains	3	1
Available-for-sale, Recorded Basis, Total	1,560	1,409
Short-term Investments | Available-for-sale Securities | Government and agency securities
Available For Sale And Held To Maturity [Line Items]
Available-For-Sale, Cost Basis	1,553	1,404
Unrealized gains	3	1
Available-for-sale, Recorded Basis, Total	1,556	1,405
Short-term Investments | Available-for-sale Securities | Asset and mortgage backed securities
Available For Sale And Held To Maturity [Line Items]
Available-For-Sale, Cost Basis	4	4
Unrealized gains	0	0
Available-for-sale, Recorded Basis, Total	4	4
Short-term Investments | Held-to-maturity Securities
Available For Sale And Held To Maturity [Line Items]
Held-to-maturity, Cost Basis		168
Held-to-maturity, Recorded Basis, Total		168
Short-term Investments | Held-to-maturity Securities | Certificates of Deposit [Member]
Available For Sale And Held To Maturity [Line Items]
Held-to-maturity, Cost Basis	27	155
Held-to-maturity, Recorded Basis, Total	27	155
Short-term Investments | Held-to-maturity Securities | Bankers' Acceptances
Available For Sale And Held To Maturity [Line Items]
Held-to-maturity, Cost Basis		13
Held-to-maturity, Recorded Basis, Total		$ 13

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Investments - Proceeds from Sales of Available for Sale Securities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 50	$ 22	$ 67	$ 32

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Investments - Maturities of Available for Sale and Held to Maturity Securities (Details) (USD $) In Millions, unless otherwise specified	Feb. 15, 2015
Available-For-Sale, Cost Basis
Due in one year or less	$ 292
Due after one year through five years	1,193
Due after five years	72
Available-For-Sale, Cost Basis, Total	1,557
Available-For-Sale, Fair Value
Due in one year or less	292
Due after one year through five years	1,194
Due after five years	74
Available-for-sale, Recorded Basis, Total	1,560
Held-To-Maturity
Due in one year or less	27
Due after one year through five years	0
Due after five years	0
Held-To-Maturity, Cost Basis, Total	$ 27

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Fair Value Measurement - Fair Value of Financial Assets and Financial Liabilities Measured on Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Feb. 15, 2015	Aug. 31, 2014
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	$ 145	$ 312
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	1,571	1,409
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	145	312
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	0	0
Government and agency securities | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	0	0
Government and agency securities | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	1,556	1,405
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	0	0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	4	4
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	0	0
Fair value of liabilities measured on recurring basis	0	0
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of assets measured on recurring basis	14	3
Fair value of liabilities measured on recurring basis	$ (3)	$ (3)

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Debt (Carrying Value and Estimated Fair Value of Company's Long Term Debt) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Feb. 15, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Total long-term debt, carrying value	$ 5,030	$ 5,093
Less current portion, carrying value	1,200	0
Long-term debt, excluding current maturities	3,830	5,093
Total long-term debt, fair value	5,143	5,217
Less current portion, fair value	1,203	0
Long-term debt, excluding current portion, fair value	3,940	5,217
0.65% Senior Notes due December 2015
Debt Instrument [Line Items]
Debt instrument, stated interest rate (percent)	0.65%
Debt instrument, principal due date	2015-12
Total long-term debt, carrying value	1,200	1,199
Total long-term debt, fair value	1,203	1,203
5.5% Senior Notes due March 2017
Debt Instrument [Line Items]
Debt instrument, stated interest rate (percent)	5.50%
Debt instrument, principal due date	2017-03
Total long-term debt, carrying value	1,099	1,099
Total long-term debt, fair value	1,201	1,223
1.125% Senior Notes due December 2017
Debt Instrument [Line Items]
Debt instrument, stated interest rate (percent)	1.13%
Debt instrument, principal due date	2017-12
Total long-term debt, carrying value	1,100	1,100
Total long-term debt, fair value	1,102	1,095
1.7% Senior Notes due December 2019
Debt Instrument [Line Items]
Debt instrument, stated interest rate (percent)	1.70%
Debt instrument, principal due date	2019-12
Total long-term debt, carrying value	1,198	1,198
Total long-term debt, fair value	1,194	1,186
Other Long Term Debt
Debt Instrument [Line Items]
Total long-term debt, carrying value	433	497
Total long-term debt, fair value	$ 443	$ 510

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Debt (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Feb. 15, 2015	Feb. 17, 2015
1.75% Senior Notes due February 2020
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb 15, 2020
Debt instrument, frequency of periodic payment	Interest is due semi-annually on February 15 and August 15, with the first payment due on August 15, 2015
2.25% Senior Notes due February 2022
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb 15, 2022
Debt instrument, frequency of periodic payment	Interest is due semi-annually on February 15 and August 15, with the first payment due on August 15, 2015
Subsequent Event [Member]
Debt Instrument [Line Items]
Senior note		$ 1,000
Subsequent Event [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price company option		100.00%
Redemption price certain events		101.00%
Subsequent Event [Member] | 1.75% Senior Notes due February 2020
Debt Instrument [Line Items]
Senior note		500
Senior note, interest rate		1.75%
Subsequent Event [Member] | 2.25% Senior Notes due February 2022
Debt Instrument [Line Items]
Senior note		$ 500
Senior note, interest rate		2.25%

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Equity and Comprehensive Income - Additional Information - Dividends (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Class of Stock [Line Items]
Dividends declared	$ 5.355	$ 0.31	$ 5.71	$ 0.62
Payment of dividends	$ 2,358		$ 156	$ 137
Dividend Declared [Member]
Class of Stock [Line Items]
Dividends declared	$ 0.355	$ 0.31
Special Dividend [Member]
Class of Stock [Line Items]
Dividends declared	$ 5

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Equity and Comprehensive Income Equity and Comprehensive Income - Additional Information - Stock Repurchase Programs (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Equity [Abstract]
Shares repurchased	642,000	0	781,000	0
Average price per share	$ 143.21		$ 140.23
Total cost	$ 92		$ 110
Stock repurchase authorization amount remaining	$ 2,611		$ 2,611

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Changes in Equity Attributes to Costco and the Noncontrolling Interests of Consolidated Subsidiaries (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity at beginning of period			$ 12,515	$ 11,012
Comprehensive income:
Net income	607	473	1,112	904
Foreign-currency translation adjustment and other, net	(410)	(120)	(732)	(36)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COSTCO	189	347	373	853
Comprehensive income	197	353	380	868
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	8	6	7	15
Stock-based compensation			236	185
Stock options exercised, including tax effects			39	18
Release of vested restricted stock units (RSUs), including tax effects			(121)	(101)
Repurchases of common stock	(92)		(110)
Cash dividends declared			(2,514)	(273)
Equity at end of period	10,425	11,709	10,425	11,709
Attributable to Costco
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity at beginning of period			12,303	10,833
Comprehensive income:
Net income			1,094	888
Foreign-currency translation adjustment and other, net			(721)	(35)
Stock-based compensation			236	185
Stock options exercised, including tax effects			39	18
Release of vested restricted stock units (RSUs), including tax effects			(121)	(101)
Repurchases of common stock			(110)
Cash dividends declared			(2,514)	(273)
Equity at end of period	10,206	11,515	10,206	11,515
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity at beginning of period			212	179
Comprehensive income:
Net income			18	16
Foreign-currency translation adjustment and other, net			(11)	(1)
Equity at end of period	$ 219	$ 194	$ 219	$ 194

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Stock-Based Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Feb. 15, 2015	Feb. 09, 2015	Aug. 31, 2014	Feb. 04, 2015	Feb. 05, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares authorized	23,500,000
Special cash dividend shares adjustment ratio		1.0429
Special cash dividend exercise price adjustment ratio		0.9589
Number of stock options outstanding		410,000
Number of RSUs outstanding		8,956,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares authorized	13,429,000
Additional shares available to be granted		750,000
Number of RSUs outstanding	9,332,000		9,117,000
Number of shares available to be granted as RSUs	18,242,000
Time-based RSUs awards outstanding	8,786,000
Performance-based RSUs awards outstanding	265,000
Outstanding performance-based RSUs awards to be granted	281,000
Unrecognized compensation cost	808
Weighted-average recognition period	1 year 10 months 2 days
Closing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price				$ 155.92
Opening [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price					$ 149.5

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Stock-Based Compensation Plans - Summary of RSU Transactions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Feb. 15, 2015	Feb. 09, 2015
Number of units
Outstanding at August 31, 2014		8,956
Outstanding at February 15, 2015		8,956
Restricted Stock Units (RSUs)
Number of units
Outstanding at August 31, 2014	9,117
Granted	4,017
Vested and delivered	(4,070)
Forfeited	(108)
Special cash dividend	376
Outstanding at February 15, 2015	9,332
Weighted average grant date fair value
Outstanding at August 31, 2014	$ 86.92
Granted	$ 125.68
Vested and delivered	$ 87.26
Forfeited	$ 105.29
Outstanding at February 15, 2015	$ 99.69

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Stock-Based Compensation Plans - Summary of Stock-Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total stock-based compensation expense before income taxes	$ 86	$ 73	$ 236	$ 185
Less recognized income tax benefit	(29)	(24)	(80)	(62)
Total stock-based compensation expense, net of income taxes	$ 57	$ 49	$ 156	$ 123

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Income Taxes Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Percent	30.20%	35.00%	32.60%	34.80%
Discrete Income Tax Benefit	$ 45		$ 44
Ownership of employee, shares	29		29
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Income Tax Expense (Benefit), Ongoing Tax Matter			14
Special Dividend [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount			$ 57

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Net Income per Common and Common Equivalent Share - Schedule of Earnings per Share Effect on Net Income and Weighted Averegae Number of Dilutive Potential Common Stock (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014
Earnings Per Share [Abstract]
Net income available to common stockholders after assumed conversion of dilutive securities	$ 598	$ 463	$ 1,094	$ 888
Weighted average number of common shares used in basic net income per common share	440,384	439,776	439,567	438,868
RSUs and stock options	2,500	3,025	2,943	3,730
Conversion of convertible notes	12	28	12	29
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share	442,896	442,829	442,522	442,627

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Feb. 15, 2015
Commitments and Contingencies Disclosure [Abstract]
Damages sought	$ 10

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Segment Reporting Information by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Feb. 15, 2015	Feb. 16, 2014	Feb. 15, 2015	Feb. 16, 2014	Aug. 31, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 27,454	$ 26,306	$ 54,320	$ 51,323	$ 112,640
Operating income	877	724	1,647	1,392	3,220
Depreciation and amortization	260	240	514	471	1,029
Additions to property and equipment	612	447	1,167	1,021	1,993
Net property and equipment	14,872	14,348	14,872	14,348	14,830
Total assets	33,600	31,566	33,600	31,566	33,024
Operating Segments [Member] | United States Operations
Segment Reporting Information [Line Items]
Total revenue	19,879	18,859	39,060	36,583	80,477
Operating income	556	424	989	788	1,880
Depreciation and amortization	193	174	381	344	755
Additions to property and equipment	327	228	763	613	1,245
Net property and equipment	10,403	9,891	10,403	9,891	10,132
Total assets	23,598	21,479	23,598	21,479	21,929
Operating Segments [Member] | Canadian Operations
Segment Reporting Information [Line Items]
Total revenue	4,001	4,056	8,232	8,180	17,943
Operating income	178	161	374	350	796
Depreciation and amortization	30	31	58	59	124
Additions to property and equipment	32	51	78	118	204
Net property and equipment	1,457	1,612	1,457	1,612	1,662
Total assets	3,858	4,429	3,858	4,429	4,892
Operating Segments [Member] | Other International Operations
Segment Reporting Information [Line Items]
Total revenue	3,574	3,391	7,028	6,560	14,220
Operating income	143	139	284	254	544
Depreciation and amortization	37	35	75	68	150
Additions to property and equipment	253	168	326	290	544
Net property and equipment	3,012	2,845	3,012	2,845	3,036
Total assets	$ 6,144	$ 5,658	$ 6,144	$ 5,658	$ 6,203

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