Contractual interest rate for funds borrowed, under the debt agreement.

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Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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7.25% Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
7.25% Senior Notes (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 03, 2017	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt	$ 2,349	$ 2,252
Proceeds from borrowings on long-term debt	400	0	$ 294
Senior Notes 7.25 Percent Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	0	400
Senior Notes 5.875 Percent Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 400	$ 0
Senior Notes [Member] \| Senior Notes 7.25 Percent Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%			7.25%
Long-term Debt					$ 400
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost	$ 9
Write off of Deferred Debt Issuance Cost	$ 4
Senior Notes [Member] \| Senior Notes 5.875 Percent Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%			5.875%
Long-term Debt	$ 393