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, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax at statutory rate:	$ 771	$ 315	$ 519
Tax at statutory rate (percentage):	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	$ (20)	$ (20)	$ (19)
Dividend received exclusion	(20)	(17)	(16)
Other	(7)	5	(9)
Total provision for income taxes	$ 724	$ 283	$ 475
Tax at statutory rate:
Tax-exempt income from municipal bonds (percentage)	(0.50%)	(1.30%)	(0.80%)
Dividend received exclusion (percentage)	(0.50%)	(1.10%)	(0.60%)
Other (percentage)	(0.30%)	0.30%	(0.40%)
Effective tax, percentage	19.70%	18.90%	19.20%