Long-Term Debt - Debt Balance, Net of Current Maturities and Unamortized Issuance Costs (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs, discount and current portion of capital lease obligations	$ 1,190	$ 1,192
Less:
Unamortized debt issuance cost and debt discount	(22)	(26)
Current portion of capital lease obligations	(2)	(2)
Long-term debt, net of current portion	1,166	1,164
Senior Notes \| 6.50% Senior Notes due 2022
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs, discount and current portion of capital lease obligations	$ 500	500
Less:
Stated interest rate	6.50%
Estimated fair value of total long-term debt outstanding	$ 508	515
Senior Notes \| 9.25% Senior Secured Notes due 2023
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs, discount and current portion of capital lease obligations	$ 645	645
Less:
Stated interest rate	9.25%
Estimated fair value of total long-term debt outstanding	$ 684	694
Senior Notes \| 6.50% Senior Notes due 2021
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs, discount and current portion of capital lease obligations	$ 2	2
Less:
Stated interest rate	6.50%
Capital Lease Obligations
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs, discount and current portion of capital lease obligations	$ 43	$ 45

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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