Income Taxes (Differences Between The 21 Percent Statutory Income Tax Rate And Effective Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (decrease) resulting from:
Tax at statutory rate:	$ 478	$ (146)	$ 777
Tax-exempt income from municipal bonds	(21)	(20)	(20)
Dividend received exclusion	(22)	(21)	(20)
Effective Income Tax Rate Reconciliation, Tax Accounting Method Changes, Amount	0	(34)	0
Other	(2)	14	(7)
Total provision (benefit) for income taxes	$ 433	$ (207)	$ 730
Tax at statutory rate:
Tax at statutory rate (percentage):	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.90%)	2.90%	(0.50%)
Dividend received exclusion (percentage)	(1.00%)	3.00%	(0.50%)
Effective Income Tax Rate Reconciliation, Tax Accounting Method Changes, Percent	0.00%	4.90%	0.00%
Other (percentage)	(0.10%)	(2.00%)	(0.30%)
Effective tax, percentage	19.00%	29.80%	19.70%