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Investments (Fair Values And Unrealized Losses By Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Investments, Unrealized Loss Position    
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 6,683 $ 1,384
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 121 18
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,823 7,912
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 510 669
Investments, Available-for-Sale, Unrealized Loss Position 12,506 9,296
Investments, Available-for-Sale, Unrealized Loss Position, Accumulated Loss 631 687
Short-term investments, available-for-sale, continuous unrealized loss position, less than 12 months 100 0
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Short-term investments, available-for-sale, continuous unrealized loss position, 12 months or longer 0 0
Short-term investments, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 0 0
Short-term investments, available-for-sale, unrealized loss position, total 100 0
Short-term investments, available-for-sale, unrealized loss position, accumulated loss 0 0
Less than 12 months fair value 6,583 1,384
Less than 12 Months, Unrealized losses 121 18
12 months or more fair value 5,823 7,912
12 Months or more, unrealized losses 510 669
Total fair value 12,406 9,296
Total Unrealized Losses 631 687
Corporate Securities    
Investments, Unrealized Loss Position    
Less than 12 months fair value 2,815 379
Less than 12 Months, Unrealized losses 78 13
12 months or more fair value 3,634 5,560
12 Months or more, unrealized losses 255 441
Total fair value 6,449 5,939
Total Unrealized Losses 333 454
States, Municipalities and Political Subdivisions    
Investments, Unrealized Loss Position    
Less than 12 months fair value 1,513 313
Less than 12 Months, Unrealized losses 25 2
12 months or more fair value 1,898 1,932
12 Months or more, unrealized losses 245 206
Total fair value 3,411 2,245
Total Unrealized Losses 270 208
Government-Sponsored Enterprises    
Investments, Unrealized Loss Position    
Less than 12 months fair value 1,876 652
Less than 12 Months, Unrealized losses 8 3
12 months or more fair value 92 113
12 Months or more, unrealized losses 1 3
Total fair value 1,968 765
Total Unrealized Losses 9 6
Asset-backed    
Investments, Unrealized Loss Position    
Less than 12 months fair value 331 5
Less than 12 Months, Unrealized losses 10 0
12 months or more fair value 96 172
12 Months or more, unrealized losses 7 16
Total fair value 427 177
Total Unrealized Losses 17 16
United States Government    
Investments, Unrealized Loss Position    
Less than 12 months fair value 48 32
Less than 12 Months, Unrealized losses 0 0
12 months or more fair value 100 129
12 Months or more, unrealized losses 2 3
Total fair value 148 161
Total Unrealized Losses 2 3
Foreign government    
Investments, Unrealized Loss Position    
Less than 12 months fair value 0 3
Less than 12 Months, Unrealized losses 0 0
12 months or more fair value 3 6
12 Months or more, unrealized losses 0 0
Total fair value 3 9
Total Unrealized Losses $ 0 $ 0