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

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Debt - Senior Notes (Details) - USD ($)	1 Months Ended			12 Months Ended
Debt - Senior Notes (Details) - USD ($)	Jul. 31, 2018	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 04, 2015
Debt Instrument [Line Items]
Debt extinguishment loss				$ 27,000,000	$ 36,000,000	$ 70,000,000
6.50% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt		$ 1,600,000,000		1,200,000,000	1,600,000,000
Interest rate, stated percentage								6.50%
Senior Notes \| 6.50% Senior Notes due 2022
Debt Instrument [Line Items]
Repurchase amount	$ 400,000,000
Long-term debt	$ 1,600,000,000
Redemption price	103.25%
Interest rate, stated percentage							6.50%
Senior Notes \| 5.75% Senior Notes due 2021
Debt Instrument [Line Items]
Redemption price		102.875%
Debt extinguishment loss				$ 17,000,000	$ 23,000,000
Interest rate, stated percentage								5.75%
Senior Notes \| 7.25% Senior Notes due 2018
Debt Instrument [Line Items]
Redemption price			102.168%
Debt extinguishment loss			$ 5,000,000
Interest rate, stated percentage			7.25%