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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Goodwill and Acquired Intangible Assets (Details) (Acquisition-Related Intangible Assets) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	$ 469				$ 469				$ 469	$ 469
Acquired intangible assets, accumulated amortization	(404)				(391)				(404)	(391)
Acquired intangible assets, net	65us-gaap_FiniteLivedIntangibleAssetsNet				78us-gaap_FiniteLivedIntangibleAssetsNet				65us-gaap_FiniteLivedIntangibleAssetsNet	78us-gaap_FiniteLivedIntangibleAssetsNet
Weighted-average amortization period									4 years 6 months 23 days
Amortization of acquired intangible assets	4us-gaap_AmortizationOfIntangibleAssets	3us-gaap_AmortizationOfIntangibleAssets	4us-gaap_AmortizationOfIntangibleAssets	3us-gaap_AmortizationOfIntangibleAssets	4us-gaap_AmortizationOfIntangibleAssets	5us-gaap_AmortizationOfIntangibleAssets	4us-gaap_AmortizationOfIntangibleAssets	5us-gaap_AmortizationOfIntangibleAssets	14us-gaap_AmortizationOfIntangibleAssets	18us-gaap_AmortizationOfIntangibleAssets	14us-gaap_AmortizationOfIntangibleAssets
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	258				258				258	258
Acquired intangible assets, accumulated amortization	(201)				(189)				(201)	(189)
Acquired intangible assets, net	57				69				57	69
Weighted-average amortization period									5 years 1 month 23 days
Amortization of acquired intangible assets									13	13	9
In Process Research and Development
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	6				6				6	6
Acquired intangible assets, accumulated amortization	0				0				0	0
Acquired intangible assets, net	6				6				6	6
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	168				168				168	168
Acquired intangible assets, accumulated amortization	(167)				(166)				(167)	(166)
Acquired intangible assets, net	1				2				1	2
Weighted-average amortization period									1 year 3 months 0 days
Amortization of acquired intangible assets									1	1	1
Trademark and Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	37				37				37	37
Acquired intangible assets, accumulated amortization	(36)				(36)				(36)	(36)
Acquired intangible assets, net	1				1				1	1
Weighted-average amortization period									1 year 3 months 0 days
Amortization of acquired intangible assets									$ 0	$ 4	$ 4