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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Discrete income tax expense (benefit)	$ 0	$ 39	$ 152	$ 4	$ (113)
Income tax expense (benefit)	15	40		34	(142)
Pre-tax income (loss)	$ 59	$ (3)		$ 131	$ (17)
Effective tax rate (percentage)	25.40%	(1333.30%)		26.00%	835.30%
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)						30.00%

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