Investments (Investment Income Realized Investment Gains And Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment income:
Interest	$ 510	$ 477	$ 455
Dividends	275	246	220
Other	11	5	8
Total	796	728	683
Less investment expenses	15	14	13
Total	781	714	670
Gain (Loss) on Sale of Investments	(1,493)	2,353	851
Investment gains and losses, net:
Other	46	97	10
Total	(1,467)	2,409	865
Fixed Maturities
Investment gains and losses, net:
Gross realized gains	6	36	16
Gross realized losses	(4)	(5)	(3)
Write-down of impaired securities	(5)	(1)	(78)
Total	(3)	30	(65)
Equity Securities
Investment income:
Gain (Loss) on Sale of Investments	16	4	79
Unrealized Gain (Loss) on Investments	(1,526)	2,278	841
Investment gains and losses, net:
Total	$ (1,510)	$ 2,282	$ 920