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
Jun. 27, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value $ 829 $ 805
Current marketable securities, at fair value   235
Cash and cash equivalents and marketable securities, at fair value 829 1,040
Fair Value, Inputs, Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value 2 4
Current marketable securities, at fair value   0
Cash and cash equivalents and marketable securities, at fair value 2 4
Fair Value, Inputs, Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value 475 410
Current marketable securities, at fair value   235
Cash and cash equivalents and marketable securities, at fair value 475 645
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value 352 391
Cash and cash equivalents and marketable securities, at fair value 352 391
Money Market Funds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value 2 4
Current marketable securities, at fair value   0
Cash and cash equivalents and marketable securities, at fair value 2 4
Available-for-sale investments used as collateral   10
Commercial Paper    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents, at fair value 475 410
Current marketable securities, at fair value   208
Cash and cash equivalents and marketable securities, at fair value $ 475 618
Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents and marketable securities, at fair value   $ 27