Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Federal
Current	$ 404	$ 353
Deferred	(102)	130
Federal income tax	302	483
State
Current	89	94
Deferred	6	30
State income tax	95	124
Applicable income taxes	$ 397	$ 607