Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal, current	$ 894	$ 669	$ 570
State, current	191	158	152
Total current	1,085	827	722
Federal, deferred	123	(373)	187
State, deferred	55	(28)	(8)
Total deferred	178	(401)	179
Total	$ 1,263	$ 426	$ 901