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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, 2024
Dec. 31, 2023
Investments, Unrealized Loss Position    
Less than 12 months Fair Value $ 1,452 $ 1,384
Less than 12 Months, Unrealized Loss 10 18
12 months or more, Fair Value 6,272 7,912
12 months or longer, Unrealized Loss 394 669
Total Fair Value 7,724 9,296
Total Unrealized Losses 404 687
Corporate    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 402 379
Less than 12 Months, Unrealized Loss 5 13
12 months or more, Fair Value 3,937 5,560
12 months or longer, Unrealized Loss 213 441
Total Fair Value 4,339 5,939
Total Unrealized Losses 218 454
States, municipalities and political subdivisions    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 287 313
Less than 12 Months, Unrealized Loss 4 2
12 months or more, Fair Value 2,000 1,932
12 months or longer, Unrealized Loss 172 206
Total Fair Value 2,287 2,245
Total Unrealized Losses 176 208
Government-sponsored enterprises    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 715 652
Less than 12 Months, Unrealized Loss 1 3
12 months or more, Fair Value 128 113
12 months or longer, Unrealized Loss 0 3
Total Fair Value 843 765
Total Unrealized Losses 1 6
Asset-backed    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 48 5
Less than 12 Months, Unrealized Loss 0 0
12 months or more, Fair Value 99 172
12 months or longer, Unrealized Loss 7 16
Total Fair Value 147 177
Total Unrealized Losses 7 16
United States government    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 0 32
Less than 12 Months, Unrealized Loss 0 0
12 months or more, Fair Value 103 129
12 months or longer, Unrealized Loss 2 3
Total Fair Value 103 161
Total Unrealized Losses 2 3
Foreign government    
Investments, Unrealized Loss Position    
Less than 12 months Fair Value 0 3
Less than 12 Months, Unrealized Loss 0 0
12 months or more, Fair Value 5 6
12 months or longer, Unrealized Loss 0 0
Total Fair Value 5 9
Total Unrealized Losses $ 0 $ 0