Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current, Federal	$ 1,769	$ 1,021	$ 670
Current, State	311	126	134
Current, Foreign	15	5	17
Deferred, Federal	24	(73)	254
Deferred, State	(18)	(39)	29
Deferred, Foreign	11	3	(5)
Provision for income taxes	$ 2,112	$ 1,043	$ 1,099