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, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense at statutory federal rate	$ 242	$ 304	$ 141
State income taxes including credits, net	38	48	21
Other nondeductible expenses	13	8	8
Nontaxable income	(40)	(36)	(32)
Share-based compensation	(4)	(3)	(1)
Tax credits and other taxes	(4)	(4)	(4)
Total income tax expense	$ 245	$ 317	$ 133