Income Taxes (Schedule of Statutory Federal Income Tax Rate Reconciles to Actual Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense at statutory federal rate	$ 186	$ 242	$ 304
State income taxes including credits, net	31	38	48
Other nondeductible expenses	29	13	8
Nontaxable income	(41)	(40)	(36)
Share-based compensation	(1)	(4)	(3)
Other	2	(4)	(4)
Total income tax expense	$ 206	$ 245	$ 317