Income Taxes (Reconciliation Of Income Tax Expense Computed At The Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Amount at statutory rate, amount	$ 1,631	$ 1,664	$ 1,310
Amount at statutory rate, percent	21.00%	21.00%	21.00%
State and local income taxes net of federal tax expense/benefit, amount	$ 238	$ 258	$ 235
State and local income taxes net of federal tax expense/benefit, percent	3.00%	3.30%	3.80%
Tax exempt interest and dividends received deduction, amount	$ (19)	$ (22)	$ (22)
Tax exempt interest and dividends received deduction, percent	(0.20%)	(0.30%)	(0.40%)
Health Insurance Provider fee, amount	$ 0	$ 0	$ 330
Health Insurance Provider fee, percent	0.00%	0.00%	5.30%
Basis adjustments from recent acquisitions, amount	$ 0	$ 0	$ (110)
Basis adjustments from recent acquisitions, percent	0.00%	0.00%	(1.80%)
Other, net amount	$ (100)	$ (70)	$ (77)
Other, net percent	(1.30%)	(0.90%)	(1.20%)
Total income tax expense	$ 1,750	$ 1,830	$ 1,666
Total income tax expense, percent	22.50%	23.10%	26.70%