Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory U.S. federal tax expense	$ 492	$ 810	$ 297
State and local income taxes, net of federal income tax benefit	77	106	36
Tax credits, excluding expirations	(73)	(58)	(29)
Settlement of qualified defined benefit pension plan	61	0	0
Valuation allowance change, excluding expirations	54	(78)	(3)
Nondeductible expenses	31	30	37
Other, net	(15)	(20)	(10)
Total income tax expense from continuing operations	$ 627	$ 790	$ 328