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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 | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | $ 34,049 |  | $ 29,934 |  |  |
Allowance for Credit Losses | (51) | $ (40) | (36) | $ (51) | $ (42) | $ (48)
Unrealized Appreciation | 621 |  | 167 |  |  |
Unrealized Depreciation | (708) |  | (1,157) |  |  |
Fair Value | 33,912 |  | 28,908 |  |  |
Fixed maturity securities – held to maturity |  |  |  |  |  |
Amortized Cost | 610 |  | 765 |  |  |
Allowance for Credit Losses | (6) | (7) | (8) | (8) | (8) | (8)
Unrealized Appreciation | 19 |  | 14 |  |  |
Unrealized Depreciation | (10) |  | (12) |  |  |
Fair Value | 613 |  | 759 |  |  |
U.S. Treasury securities and obligations of U.S. government agencies and corporations |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 770 |  | 688 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 4 |  | 5 |  |  |
Unrealized Depreciation | (22) |  | (24) |  |  |
Fair Value | 752 |  | 669 |  |  |
Obligations of U.S. States and political subdivisions |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 55 |  | 75 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 0 |  | 0 |  |  |
Unrealized Depreciation | (6) |  | (5) |  |  |
Fair Value | 49 |  | 70 |  |  |
Corporate securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 9,734 |  | 7,288 |  |  |
Allowance for Credit Losses | (38) | (39) | (35) | (50) | (42) | (47)
Unrealized Appreciation | 199 |  | 57 |  |  |
Unrealized Depreciation | (189) |  | (299) |  |  |
Fair Value | 9,705 |  | 7,010 |  |  |
Fixed maturity securities – held to maturity |  |  |  |  |  |
Amortized Cost | 167 |  | 177 |  |  |
Allowance for Credit Losses | (2) | (2) | (2) | (2) | (2) | (2)
Unrealized Appreciation | 7 |  | 5 |  |  |
Unrealized Depreciation | (1) |  | (4) |  |  |
Fair Value | 170 |  | 175 |  |  |
Asset-backed securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 5,049 |  | 5,994 |  |  |
Allowance for Credit Losses | (14) | 0 | 0 | 0 | 0 | 0
Unrealized Appreciation | 23 |  | 28 |  |  |
Unrealized Depreciation | (15) |  | (39) |  |  |
Fair Value | 5,044 |  | 5,982 |  |  |
Fixed maturity securities – held to maturity |  |  |  |  |  |
Amortized Cost | 364 |  | 484 |  |  |
Allowance for Credit Losses | (3) | (4) | (4) | (5) | (5) | (5)
Unrealized Appreciation | 6 |  | 5 |  |  |
Unrealized Depreciation | (8) |  | (8) |  |  |
Fair Value | 358 |  | 477 |  |  |
Commercial |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost |  |  | 965 |  |  |
Allowance for Credit Losses |  |  | 0 |  |  |
Unrealized Appreciation |  |  | 1 |  |  |
Unrealized Depreciation |  |  | (66) |  |  |
Fair Value |  |  | 900 |  |  |
Fixed maturity securities – held to maturity |  |  |  |  |  |
Amortized Cost | 1 |  | 21 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 0 |  | 0 |  |  |
Unrealized Depreciation | 0 |  | 0 |  |  |
Fair Value | 1 |  | 21 |  |  |
Agency commercial |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 402 |  | 0 |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Unrealized Appreciation | 9 |  |  |  |  |
Unrealized Depreciation | (1) |  |  |  |  |
Fair Value | 409 |  | 0 |  |  |
Non-agency commercial |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 907 |  | 965 |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Unrealized Appreciation | 4 |  |  |  |  |
Unrealized Depreciation | (39) |  |  |  |  |
Fair Value | 872 |  | 900 |  |  |
Agency residential |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 5,594 |  | 5,205 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 68 |  | 13 |  |  |
Unrealized Depreciation | (178) |  | (287) |  |  |
Fair Value | 5,484 |  | 4,931 |  |  |
Non-agency residential |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 1,562 |  | 1,291 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 35 |  | 9 |  |  |
Unrealized Depreciation | (1) |  | (11) |  |  |
Fair Value | 1,595 |  | 1,289 |  |  |
Foreign government securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 2,534 |  | 2,330 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 35 |  | 13 |  |  |
Unrealized Depreciation | (100) |  | (147) |  |  |
Fair Value | 2,470 |  | 2,196 |  |  |
Foreign corporate securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 7,443 |  | 6,099 |  |  |
Allowance for Credit Losses | 0 | 0 | 0 | 0 | 0 | (1)
Unrealized Appreciation | 245 |  | 42 |  |  |
Unrealized Depreciation | (157) |  | (279) |  |  |
Fair Value | 7,531 |  | 5,861 |  |  |
Fixed maturity securities – held to maturity |  |  |  |  |  |
Amortized Cost | 79 |  | 84 |  |  |
Allowance for Credit Losses | (1) | $ (1) | (1) | $ (1) | $ (1) | $ (1)
Unrealized Appreciation | 6 |  | 4 |  |  |
Unrealized Depreciation | 0 |  | 0 |  |  |
Fair Value | $ 84 |  | $ 86 |  |  |

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