Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal, current	$ 1,021	$ 782	$ 894
State, current	320	227	191
Total current	1,341	1,009	1,085
Federal, deferred	(149)	307	123
State, deferred	(103)	44	55
Total deferred	(252)	351	178
Total	$ 1,089	$ 1,360	$ 1,263