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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
Sep. 30, 2025
Dec. 31, 2024
Investments, Unrealized Loss Position    
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 6,683
Investments, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   121
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer   5,823
Investments, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   510
Investments, Available-for-Sale, Unrealized Loss Position   12,506
Investments, Available-for-Sale, Unrealized Loss Position, Accumulated Loss   631
Short-term investments, available-for-sale, continuous unrealized loss position, less than 12 months   100
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Short-term investments, available-for-sale, continuous unrealized loss position, 12 months or longer   0
Short-term investments, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss   0
Short-term investments, available-for-sale, unrealized loss position, total   100
Short-term investments, available-for-sale, unrealized loss position, accumulated loss   0
Less than 12 months Fair Value $ 2,762 6,583
Less than 12 Months, Unrealized Loss 41 121
12 months or more, Fair Value 5,512 5,823
12 months or longer, Unrealized Loss 388 510
Total Fair Value 8,274 12,406
Total Unrealized Losses 429 631
Corporate    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 793 2,815
Less than 12 Months, Unrealized Loss 14 78
12 months or more, Fair Value 2,887 3,634
12 months or longer, Unrealized Loss 179 255
Total Fair Value 3,680 6,449
Total Unrealized Losses 193 333
States, municipalities and political subdivisions    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 873 1,513
Less than 12 Months, Unrealized Loss 20 25
12 months or more, Fair Value 2,019 1,898
12 months or longer, Unrealized Loss 201 245
Total Fair Value 2,892 3,411
Total Unrealized Losses 221 270
Government-sponsored enterprises    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 922 1,876
Less than 12 Months, Unrealized Loss 3 8
12 months or more, Fair Value 488 92
12 months or longer, Unrealized Loss 2 1
Total Fair Value 1,410 1,968
Total Unrealized Losses 5 9
Asset-backed    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 173 331
Less than 12 Months, Unrealized Loss 4 10
12 months or more, Fair Value 91 96
12 months or longer, Unrealized Loss 5 7
Total Fair Value 264 427
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 27 100
12 months or longer, Unrealized Loss 1 2
Total Fair Value 27 148
Total Unrealized Losses 1 2
Foreign government    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 1 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 1 3
Total Unrealized Losses $ 0 $ 0