Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory U.S. federal tax expense	$ 810	$ 297	$ 413
State and local income taxes, net of federal income tax benefit	106	36	50
Valuation allowance change, excluding expirations	(78)	(3)	(219)
Tax credits, excluding expirations	(58)	(29)	(27)
Nondeductible expenses	30	37	29
Other, net	(20)	(10)	0
Total income tax expense from continuing operations	$ 790	$ 328	$ 246