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Investments (Investment Income Realized Investment Gains And Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment income:      
Interest $ 733 $ 600 $ 510
Dividends 283 282 275
Other 25 25 11
Total 1,041 907 796
Less investment expenses 16 13 15
Total 1,025 894 781
Investment gains and losses, net:      
Gain (Loss) on Sale of Investments 1,367 1,108 (1,493)
Other 51 (2) 46
Total 1,391 1,127 (1,467)
Equity Securities      
Investment gains and losses, net:      
Gain (Loss) on Sale of Investments 181 (17) 16
Unrealized gains and losses on securities still held, net 1,275 1,168 (1,526)
Total 1,456 1,151 (1,510)
Fixed Maturities      
Investment gains and losses, net:      
Gross realized gains 5 4 6
Gross realized losses (95) (5) (4)
Change in allowance for credit losses, net (26) (17) 0
Write-down of impaired securities with intent to sell 0 (4) (5)
Total $ (116) $ (22) $ (3)