Face (par) amount of debt instrument at time of issuance.

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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Fair value amount of debt instrument that was repurchased.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

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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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, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 28, 2019
Debt Instrument [Line Items]
Debt extinguishment loss				$ 5,000,000	$ 27,000,000	$ 36,000,000
6.75% Senior notes due 2024
Debt Instrument [Line Items]
Face amount							$ 1,000,000,000.0
Long-term debt				$ 1,000,000,000	0
Interest rate, stated percentage				6.75%
6.50% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt				$ 1,200,000,000	$ 1,200,000,000
Interest rate, stated percentage				6.50%	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%
Debt extinguishment loss					$ 17,000,000
Senior Notes \| 5.75% Senior Notes due 2021
Debt Instrument [Line Items]
Redemption price		102.875%
Debt extinguishment loss						23,000,000
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%