Investments (Investment Income Realized Investment Gains And Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment income:
Interest	$ 477	$ 455	$ 446
Dividends	246	220	201
Other	5	8	12
Total	728	683	659
Less investment expenses	14	13	13
Total	714	670	646
Gain (Loss) on Sale of Investments	2,353	851	1,640
Investment gains and losses, net:
Other	97	10	(3)
Total	2,409	865	1,650
Fixed Maturities
Investment gains and losses, net:
Gross realized gains	36	16	13
Gross realized losses	(5)	(3)	(3)
Write-down of impaired securities	(1)	(78)	(9)
Total	30	(65)	1
Equity Securities
Investment income:
Gain (Loss) on Sale of Investments	4	79	26
Unrealized Gain (Loss) on Investments	2,278	841	1,626
Investment gains and losses, net:
Total	$ 2,282	$ 920	$ 1,652