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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)	26.40%	1300.00%
Discrete income tax expense (benefit)	$ (3)	$ (152)
Discrete tax benefit related to intra-entity asset transfer		157
Tax expense related to equity compensation vesting		6
Income tax expense (benefit)	(19)	182
Pre-tax income (loss)	$ 72	$ (14)
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)			30.00%

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