Annual report pursuant to Section 13 and 15(d)

Financial Instruments (Details) (Cash, Cash Equivalents and Marketable Securities)

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Financial Instruments (Details) (Cash, Cash Equivalents and Marketable Securities) - USD ($)
$ in Millions
Dec. 26, 2015
Dec. 27, 2014
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value $ 785 $ 805
Current marketable securities, at fair value   235
Cash, cash equivalents and marketable securities, at fair value 785 1,040
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 1    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value   4
Current marketable securities, at fair value   0
Cash, cash equivalents and marketable securities, at fair value   4
Fair Value, Inputs, Level 2    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value 376 410
Current marketable securities, at fair value   235
Cash, cash equivalents and marketable securities, at fair value 376 645
Cash    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value 409 391
Current marketable securities, at fair value   0
Cash, cash equivalents and marketable securities, at fair value 409 391
Money market funds    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value [1],[2]   4
Current marketable securities, at fair value [1],[2]   0
Cash, cash equivalents and marketable securities, at fair value [1],[2]   4
Commercial paper    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value [1],[3] 376 410
Current marketable securities, at fair value [1],[3]   208
Cash, cash equivalents and marketable securities, at fair value [1],[3] $ 376 618
Corporate bond    
Schedule of Investments [Line Items]    
Cash and cash equivalents, at fair value [1],[3]   0
Current marketable securities, at fair value [1],[3]   27
Cash, cash equivalents and marketable securities, at fair value [1],[3]   $ 27
[1] The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during 2015 and 2014.
[2] The Company’s Level 1 assets are valued using quoted prices for identical instruments in active markets.
[3] 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.