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Debt - Details of the Liability Component (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal Balance $ 1,552 $ 1,553
Unamortized Discount 89 120
Unamortized Issuance Costs 17 22
Net Carrying Amount 1,446 1,411
5.375% Notes    
Debt Instrument [Line Items]    
Principal Balance 700 700
Unamortized Discount 0 0
Unamortized Issuance Costs 9 11
Net Carrying Amount 691 689
1.125% Convertible Notes    
Debt Instrument [Line Items]    
Principal Balance 550 550
Unamortized Discount 73 95
Unamortized Issuance Costs 6 7
Net Carrying Amount 471 448
1.625% Convertible Notes    
Debt Instrument [Line Items]    
Principal Balance 302 302
Unamortized Discount 16 25
Unamortized Issuance Costs 2 4
Net Carrying Amount $ 284 273
Other    
Debt Instrument [Line Items]    
Principal Balance   1
Unamortized Discount   0
Unamortized Issuance Costs   0
Net Carrying Amount   $ 1