Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Federal
Current	$ 416	$ 427	$ 1,076	$ 1,052
Deferred	(51)	(51)	(50)	(46)
Federal income tax	365	376	1,026	1,006
State
Current	62	150	277	328
Deferred	4	(45)	(35)	(42)
State income tax	66	105	242	286
Applicable income taxes	$ 431	$ 481	$ 1,268	$ 1,292