Income Taxes - Applicable Income Taxes Included in the Consolidated Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income tax expense:
U.S. Federal income taxes	$ 657	$ 463	$ 788
State and local income taxes	102	69	148
Foreign income taxes	2	0	0
Total current income tax expense	761	532	936
Deferred income tax (benefit) expense:
U.S. Federal income taxes	(21)	(140)	(212)
State and local income taxes	8	(23)	(35)
Foreign income taxes	(1)	1	1
Total deferred income tax benefit	(14)	(162)	(246)
Applicable income tax expense	$ 747	$ 370	$ 690