Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details) (Cash and Cash Equivalents and Fair Value Measurements)

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Financial Instruments (Details) (Cash and Cash Equivalents and Fair Value Measurements) - USD ($)
$ in Millions
Mar. 26, 2016
Dec. 26, 2015
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value $ 716 $ 785
Fair value, level 1 to level 2 transfers, amount 0 0
Fair value, level 2 to level 1 transfers, amount 0 0
Fair Value, Inputs, Level 2    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value 407 376
Cash    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value 309 409
Commercial Paper | Fair Value, Inputs, Level 2    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value [1],[2] $ 407 $ 376
[1] The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the quarter ended March 26, 2016 or the year ended December 26, 2015.
[2] The Company’s Level 2 short-term investments are valued using broker reports that utilize quoted market prices for identical or comparable instruments. Brokers gather observable inputs for all of the Company’s fixed income securities from a variety of industry data providers and other third-party sources.