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Debt (Convertible Debt) (Details) - Convertible Debt - 2.125% Convertible Senior Notes due 2026 - USD ($)
$ in Millions
Sep. 24, 2016
Sep. 14, 2016
Debt Instrument [Line Items]    
Principal $ 700 $ 700
Unamortized debt discount (273)  
Unamortized debt issuance costs (12)  
Net carrying amount 415  
Carrying amount of the equity component 266  
Equity issuance costs $ 8