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Investments - Fair Values and Unrealized Losses by Investment Category and by Duration of Securities' Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Investments, Unrealized Loss Position    
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 5,073 $ 6,683
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 95 121
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,847 5,823
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 487 510
Investments, Available-for-Sale, Unrealized Loss Position 10,920 12,506
Investments, Available-for-Sale, Unrealized Loss Position, Accumulated Loss 582 631
Short-term investments, available-for-sale, continuous unrealized loss position, less than 12 months 100 100
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 100 100
Short-term investments, available-for-sale, unrealized loss position, accumulated loss 0 0
Less than 12 months Fair Value 4,973 6,583
Less than 12 Months, Unrealized Loss 95 121
12 months or more, Fair Value 5,847 5,823
12 months or longer, Unrealized Loss 487 510
Total Fair Value 10,820 12,406
Total Unrealized Losses 582 631
Corporate    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 2,184 2,815
Less than 12 Months, Unrealized Loss 53 78
12 months or more, Fair Value 3,487 3,634
12 months or longer, Unrealized Loss 225 255
Total Fair Value 5,671 6,449
Total Unrealized Losses 278 333
States, municipalities and political subdivisions    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 1,565 1,513
Less than 12 Months, Unrealized Loss 36 25
12 months or more, Fair Value 2,075 1,898
12 months or longer, Unrealized Loss 255 245
Total Fair Value 3,640 3,411
Total Unrealized Losses 291 270
Government-sponsored enterprises    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 1,002 1,876
Less than 12 Months, Unrealized Loss 2 8
12 months or more, Fair Value 102 92
12 months or longer, Unrealized Loss 1 1
Total Fair Value 1,104 1,968
Total Unrealized Losses 3 9
Asset-backed    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 222 331
Less than 12 Months, Unrealized Loss 4 10
12 months or more, Fair Value 88 96
12 months or longer, Unrealized Loss 5 7
Total Fair Value 310 427
Total Unrealized Losses 9 17
United States government    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 0 48
Less than 12 Months, Unrealized Loss 0 0
12 months or more, Fair Value 95 100
12 months or longer, Unrealized Loss 1 2
Total Fair Value 95 148
Total Unrealized Losses 1 2
Foreign government    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 months or more, Fair Value 0 3
12 months or longer, Unrealized Loss 0 0
Total Fair Value 0 3
Total Unrealized Losses $ 0 $ 0