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

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Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 26, 2019
Debt Instrument [Line Items]
Income tax expense (benefit)	$ 143,000,000	$ 313,000,000		$ 233,000,000	$ 311,000,000
Increase (decrease) in deferred tax asset valuation allowance			$ (235,000,000)
Senior Notes \| 101% notes maturing 2029
Debt Instrument [Line Items]
Debt instrument, face amount			$ 700,000,000			$ 700,000,000