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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Details of the liability component:    
Total Principal Balance $ 1,552 $ 1,553
Unamortized Discount 96 120
Unamortized Issuance Costs 19 22
Net Carrying Amount 1,437 1,411
5.375% Notes    
Details of the liability component:    
Total Principal Balance 700 700
Unamortized Discount 0 0
Unamortized Issuance Costs 10 11
Net Carrying Amount 690 689
1.125% Convertible Notes    
Details of the liability component:    
Total Principal Balance 550 550
Unamortized Discount 78 95
Unamortized Issuance Costs 6 7
Net Carrying Amount 466 448
1.625% Notes    
Details of the liability component:    
Total Principal Balance 302 [1] 302
Unamortized Discount 18 25
Unamortized Issuance Costs 3 4
Net Carrying Amount $ 281 273
Other    
Details of the liability component:    
Total Principal Balance   1
Unamortized Discount   0
Unamortized Issuance Costs   0
Net Carrying Amount   $ 1
[1] The 1.625% Notes have a contractual maturity date in 2044; however, on contractually specified dates beginning in 2018, holders of the 1.625% Notes may require us to repurchase some or all of the 1.625% Notes, or we may redeem any or all of the 1.625% Notes.