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Investments (Analysis Of Cost Or Amortized Cost Gross Unrealized Gains And Losses And Fair Value For Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities    
Investments, available-for-sale, total $ 17,033 $ 14,361
Investments, available-for-sale, unrealized gains 78 117
Investments, available-for-sale, unrealized losses 631 687
Fair value of investments, available-for-sale 16,480 13,791
Short-term investments, Total 298 0
Short-term investments, unrealized gains 0 0
Short-term investments, unrealized losses 0 0
Fair value of short-term investments 298 0
Total 16,735 14,361
Fixed maturities, unrealized gains 78 117
Fixed maturities, unrealized losses 631 687
Fair value of fixed maturities 16,182 13,791
Corporate Securities    
Schedule of Available-for-sale Securities    
Total 8,652 7,836
Fixed maturities, unrealized gains 61 70
Fixed maturities, unrealized losses 333 454
Fair value of fixed maturities 8,380 7,452
States, Municipalities and Political Subdivisions    
Schedule of Available-for-sale Securities    
Total 4,976 4,867
Fixed maturities, unrealized gains 15 44
Fixed maturities, unrealized losses 270 208
Fair value of fixed maturities 4,721 4,703
Government-Sponsored Enterprises    
Schedule of Available-for-sale Securities    
Total 2,282 1,227
Fixed maturities, unrealized gains 1 3
Fixed maturities, unrealized losses 9 6
Fair value of fixed maturities 2,274 1,224
Asset-backed    
Schedule of Available-for-sale Securities    
Total 567 203
Fixed maturities, unrealized gains 1 0
Fixed maturities, unrealized losses 17 16
Fair value of fixed maturities 551 187
United States Government    
Schedule of Available-for-sale Securities    
Total 228 203
Fixed maturities, unrealized gains 0 0
Fixed maturities, unrealized losses 2 3
Fair value of fixed maturities 226 200
Foreign Government    
Schedule of Available-for-sale Securities    
Total 30 25
Fixed maturities, unrealized gains 0 0
Fixed maturities, unrealized losses 0 0
Fair value of fixed maturities $ 30 $ 25