Investments (Investment Income Realized Investment Gains And Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment income:
Interest	$ 600	$ 510	$ 477
Dividends	282	275	246
Other	25	11	5
Total	907	796	728
Less investment expenses	13	15	14
Total	894	781	714
Gain (Loss) on Sale of Investments	1,108	(1,493)	2,353
Investment gains and losses, net:
Other	(2)	46	97
Total	1,127	(1,467)	2,409
Fixed Maturities
Investment gains and losses, net:
Gross realized gains	4	6	36
Gross realized losses	(5)	(4)	(5)
Change in allowance for credit losses, net	(17)	0	0
Write-down of impaired securities with intent to sell	(4)	(5)	(1)
Total	(22)	(3)	30
Equity Securities
Investment income:
Gain (Loss) on Sale of Investments	(17)	16	4
Unrealized Gain (Loss) on Investments	1,168	(1,526)	2,278
Investment gains and losses, net:
Total	$ 1,151	$ (1,510)	$ 2,282