Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details) (Schedule of Available-For-Sale Securities and Fair Value Measurements)

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Financial Instruments (Details) (Schedule of Available-For-Sale Securities and Fair Value Measurements) - USD ($)
$ in Millions
Sep. 26, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value $ 755 $ 805
Current marketable securities, at fair value   235
Cash and cash equivalents and marketable securities, at fair value 755 1,040
Fair Value, Inputs, Level 1    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value   4
Current marketable securities, at fair value   0
Cash and cash equivalents and marketable securities, at fair value   4
Fair Value, Inputs, Level 2    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value 385 410
Current marketable securities, at fair value   235
Cash and cash equivalents and marketable securities, at fair value 385 645
Cash    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value 370 391
Current marketable securities, at fair value   0
Cash and cash equivalents and marketable securities, at fair value 370 391
Money Market Funds    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value [1],[2]   4
Current marketable securities, at fair value [1],[2]   0
Cash and cash equivalents and marketable securities, at fair value [1],[2]   4
Money Market Funds | Fair Value, Inputs, Level 1    
Schedule of Available-for-sale Securities    
Available-for-sale investments used as collateral 1 10
Commercial Paper    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value [1],[3] 385 410
Current marketable securities, at fair value [1],[3]   208
Cash and cash equivalents and marketable securities, at fair value [1],[3] $ 385 618
Corporate Bonds    
Schedule of Available-for-sale Securities    
Cash and cash equivalents, at fair value   0
Current marketable securities, at fair value [1],[3]   27
Cash and 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 the quarter and nine months ended September 26, 2015 or the year ended December 27, 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.