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Investments - Available for Sale Securities in Continuous Unrealized Loss Position (Details) $ in Millions | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Fair Value, Less than 12 Months | $ 13,886 | $ 11,248
Fair Value, 12 Months or More | 30,118 | 31,037
Fair Value, Total | 44,004 | 42,285
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 291 | 493
Gross Unrealized Losses, 12 Months or More | 3,490 | 3,392
Gross Unrealized Losses, Total | $ 3,781 | $ 3,885
Number of securities in an unrealized loss position | security | 13,477 | 13,052
Number of individual securities in continuous unrealized loss position for longer than twelve months | security | 9,923 | 10,027
U.S. government and government sponsored entities |  |
Fair Value |  |
Fair Value, Less than 12 Months | $ 2,137 | $ 1,027
Fair Value, 12 Months or More | 1,274 | 804
Fair Value, Total | 3,411 | 1,831
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 20 | 10
Gross Unrealized Losses, 12 Months or More | 97 | 79
Gross Unrealized Losses, Total | 117 | 89
Obligations of states, municipalities and political subdivisions |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,529 | 850
Fair Value, 12 Months or More | 1,904 | 1,602
Fair Value, Total | 3,433 | 2,452
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 31 | 24
Gross Unrealized Losses, 12 Months or More | 144 | 133
Gross Unrealized Losses, Total | 175 | 157
Non-U.S. governments |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,492 | 1,431
Fair Value, 12 Months or More | 4,504 | 4,503
Fair Value, Total | 5,996 | 5,934
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 44 | 87
Gross Unrealized Losses, 12 Months or More | 611 | 583
Gross Unrealized Losses, Total | 655 | 670
Corporate debt |  |
Fair Value |  |
Fair Value, Less than 12 Months | 5,683 | 4,089
Fair Value, 12 Months or More | 16,911 | 18,612
Fair Value, Total | 22,594 | 22,701
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 112 | 171
Gross Unrealized Losses, 12 Months or More | 2,050 | 2,070
Gross Unrealized Losses, Total | 2,162 | 2,241
RMBS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 1,114 | 1,456
Fair Value, 12 Months or More | 2,752 | 2,385
Fair Value, Total | 3,866 | 3,841
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 48 | 114
Gross Unrealized Losses, 12 Months or More | 398 | 300
Gross Unrealized Losses, Total | 446 | 414
CMBS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 999 | 1,024
Fair Value, 12 Months or More | 1,991 | 1,622
Fair Value, Total | 2,990 | 2,646
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 17 | 54
Gross Unrealized Losses, 12 Months or More | 136 | 137
Gross Unrealized Losses, Total | 153 | 191
CLO/ABS |  |
Fair Value |  |
Fair Value, Less than 12 Months | 932 | 1,371
Fair Value, 12 Months or More | 782 | 1,509
Fair Value, Total | 1,714 | 2,880
Gross Unrealized Losses |  |
Gross Unrealized Losses, Less than 12 Months | 19 | 33
Gross Unrealized Losses, 12 Months or More | 54 | 90
Gross Unrealized Losses, Total | $ 73 | $ 123

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