Income Taxes (Schedule of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal:
Current	$ 168	$ 236	$ 230
Deferred	0	(38)	27
Total Federal	168	198	257
State:
Current	47	52	55
Deferred	(9)	(5)	5
Total State	38	47	60
Total income tax expense	$ 206	$ 245	$ 317