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Debt and Other Obligations (Details) (Interest Expense Recognized) - 2.125% Convertible Senior Notes Due 2026
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Contractual interest expense $ 5
Interest cost related to amortization of debt issuance costs 0
Interest cost related to amortization of the debt discount $ 6