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INVESTMENTS - Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Appreciation/(Depreciation) and Fair Value of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | $ 32,505 | $ 29,934 |  |
Allowance for Credit Losses | (37) | (36) | $ (46) | $ (48)
Unrealized Appreciation | 277 | 167 |  |
Unrealized Depreciation | (921) | (1,157) |  |
Fair Value | 31,824 | 28,908 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 703 | 765 |  |
Allowance for Credit Losses | (8) | (8) | (9) | (8)
Unrealized Appreciation | 16 | 14 |  |
Unrealized Depreciation | (9) | (12) |  |
Fair Value | 702 | 759 |  |
U.S. Treasury securities and obligations of U.S. government agencies and corporations |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 624 | 688 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 3 | 5 |  |
Unrealized Depreciation | (22) | (24) |  |
Fair Value | 604 | 669 |  |
Obligations of U.S. states and political subdivisions |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 74 | 75 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 0 | 0 |  |
Unrealized Depreciation | (6) | (5) |  |
Fair Value | 68 | 70 |  |
Corporate Securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 8,884 | 7,288 |  |
Allowance for Credit Losses | (36) | (35) | (45) | (47)
Unrealized Appreciation | 85 | 57 |  |
Unrealized Depreciation | (247) | (299) |  |
Fair Value | 8,686 | 7,010 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 169 | 177 |  |
Allowance for Credit Losses | (2) | (2) | (2) | (2)
Unrealized Appreciation | 5 | 5 |  |
Unrealized Depreciation | (3) | (4) |  |
Fair Value | 169 | 175 |  |
Asset-backed Securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 5,588 | 5,994 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 25 | 28 |  |
Unrealized Depreciation | (22) | (39) |  |
Fair Value | 5,591 | 5,982 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 435 | 484 |  |
Allowance for Credit Losses | (4) | (4) | (5) | (5)
Unrealized Appreciation | 5 | 5 |  |
Unrealized Depreciation | (6) | (8) |  |
Fair Value | 430 | 477 |  |
Commercial |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 957 | 965 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 3 | 1 |  |
Unrealized Depreciation | (54) | (66) |  |
Fair Value | 906 | 900 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 15 | 21 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 0 | 0 |  |
Unrealized Depreciation | 0 | 0 |  |
Fair Value | 15 | 21 |  |
Agency Residential |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 5,561 | 5,205 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 36 | 13 |  |
Unrealized Depreciation | (221) | (287) |  |
Fair Value | 5,377 | 4,931 |  |
Non-agency Residential |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 1,452 | 1,291 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 23 | 9 |  |
Unrealized Depreciation | (4) | (11) |  |
Fair Value | 1,471 | 1,289 |  |
Foreign government securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 2,381 | 2,330 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 17 | 13 |  |
Unrealized Depreciation | (129) | (147) |  |
Fair Value | 2,269 | 2,196 |  |
Foreign corporate securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 6,984 | 6,099 |  |
Allowance for Credit Losses | 0 | 0 | 0 | (1)
Unrealized Appreciation | 85 | 42 |  |
Unrealized Depreciation | (216) | (279) |  |
Fair Value | 6,853 | 5,861 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 84 | 84 |  |
Allowance for Credit Losses | (1) | (1) | $ (1) | $ (1)
Unrealized Appreciation | 6 | 4 |  |
Unrealized Depreciation | 0 | 0 |  |
Fair Value | $ 88 | $ 86 |  |

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