Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details)

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Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Apr. 01, 2017
Dec. 31, 2016
Carrying Amount    
Long-term debt, net $ 1,408 $ 1,435
Estimated Fair Value    
Unamortized debt issuance costs 24 25
Fair Value, Inputs, Level 2 [Member]    
Estimated Fair Value    
Long-term debt 2,595 2,313
Financial Instruments Not Recorded at Fair Value on a Recurring Basis - Long-term debt, net [Member]    
Carrying Amount    
Long-term debt, net $ 1,407 1,434
Convertible Debt [Member]    
Estimated Fair Value    
Debt Instrument, Interest Rate, Stated Percentage 2.125%  
Unamortized debt discount $ 302 $ 308