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Investments - Available for Sale Securities in Continuous Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Fair Value, Less than 12 Months | $ 21,662 | $ 11,248
Fair Value, 12 Months or More | 18,751 | 31,037
Fair Value, Total | 40,413 | 42,285
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 428 | 493
Gross Unrealized Losses, 12 Months or More | 2,655 | 3,392
Gross Unrealized Losses, Total | $ 3,083 | $ 3,885
Number of securities in an unrealized loss position | security | 12,274 | 13,052
Number of individual securities in continuous unrealized loss position for longer than twelve months | security | 5,984 | 10,027
U.S. government and government sponsored entities |  |
Fair Value |  |
Fair Value, Less than 12 Months | $ 1,718 | $ 1,027
Fair Value, 12 Months or More | 358 | 804
Fair Value, Total | 2,076 | 1,831
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 21 | 10
Gross Unrealized Losses, 12 Months or More | 78 | 79
Gross Unrealized Losses, Total | 99 | 89
Obligations of states, municipalities and political subdivisions |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,502 | 850
Fair Value, 12 Months or More | 586 | 1,602
Fair Value, Total | 2,088 | 2,452
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 33 | 24
Gross Unrealized Losses, 12 Months or More | 79 | 133
Gross Unrealized Losses, Total | 112 | 157
Non-U.S. governments |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,964 | 1,431
Fair Value, 12 Months or More | 3,446 | 4,503
Fair Value, Total | 5,410 | 5,934
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 55 | 87
Gross Unrealized Losses, 12 Months or More | 534 | 583
Gross Unrealized Losses, Total | 589 | 670
Corporate debt |  |
Fair Value |  |
Fair Value, Less than 12 Months | 10,347 | 4,089
Fair Value, 12 Months or More | 10,907 | 18,612
Fair Value, Total | 21,254 | 22,701
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 234 | 171
Gross Unrealized Losses, 12 Months or More | 1,515 | 2,070
Gross Unrealized Losses, Total | 1,749 | 2,241
RMBS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 3,711 | 1,456
Fair Value, 12 Months or More | 2,147 | 2,385
Fair Value, Total | 5,858 | 3,841
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 58 | 114
Gross Unrealized Losses, 12 Months or More | 343 | 300
Gross Unrealized Losses, Total | 401 | 414
CMBS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,052 | 1,024
Fair Value, 12 Months or More | 992 | 1,622
Fair Value, Total | 2,044 | 2,646
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 18 | 54
Gross Unrealized Losses, 12 Months or More | 71 | 137
Gross Unrealized Losses, Total | 89 | 191
CLO/ABS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,368 | 1,371
Fair Value, 12 Months or More | 315 | 1,509
Fair Value, Total | 1,683 | 2,880
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 9 | 33
Gross Unrealized Losses, 12 Months or More | 35 | 90
Gross Unrealized Losses, Total | $ 44 | $ 123

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