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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Discrete income tax expense (benefit)	$ (9)	$ (152)	$ (5)		$ (122)
Income tax benefit	9		6		151	$ 0
Pre-tax income (loss)	$ (10)		$ 4		$ (27)	$ (1)
Effective tax rate (percentage)	90.00%		(150.00%)		559.30%	0.00%
Income tax expense (benefit), marginal tax rate adjustment					$ 29
Discrete tax expense related to an uncertain tax position				$ 4
Discrete tax benefit related to intra-entity asset transfer		$ 157
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)							279.00%

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