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

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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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Feb. 26, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 130,000,000		$ 30,000,000	$ (2,000,000)	$ 45,000,000
Increase (decrease) in deferred tax asset valuation allowance	$ 39,000,000	$ (235,000,000)
Senior Notes \| 101% notes maturing 2029
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700,000,000				$ 700,000,000