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INVESTMENTS - Summary of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | $ 27,305 |  | $ 24,191 |  |  |
Allowance for Credit Losses | (60) | $ (63) | (54) | $ (38) | $ (43) | $ (30)
Unrealized Appreciation | 57 |  | 81 |  |  |
Unrealized Depreciation | (2,143) |  | (1,982) |  |  |
Fair Value | 25,159 |  | 22,236 |  |  |
Fixed maturity securities - held to maturity |  |  |  |  |  |
Amortized Cost | 797 |  | 848 |  |  |
Allowance for Credit Losses | (8) | (8) | (9) | (9) | 0 | 0
Unrealized Appreciation | 4 |  | 3 |  |  |
Unrealized Depreciation | (27) |  | (22) |  |  |
Fair Value | 766 |  | 821 |  |  |
U.S. Treasury securities and obligations of U.S. government agencies and corporations |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 1,198 |  | 1,334 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 4 |  | 6 |  |  |
Unrealized Depreciation | (81) |  | (82) |  |  |
Fair Value | 1,121 |  | 1,257 |  |  |
Obligations of U.S. states and political subdivisions |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 406 |  | 444 |  |  |
Allowance for Credit Losses | (1) | 0 | 0 |  |  |
Unrealized Appreciation | 0 |  | 2 |  |  |
Unrealized Depreciation | (42) |  | (32) |  |  |
Fair Value | 363 |  | 413 |  |  |
Corporate Securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 7,875 |  | 7,044 |  |  |
Allowance for Credit Losses | (57) | (56) | (45) | (29) | (26) | (19)
Unrealized Appreciation | 20 |  | 31 |  |  |
Unrealized Depreciation | (654) |  | (561) |  |  |
Fair Value | 7,184 |  | 6,469 |  |  |
Fixed maturity securities - held to maturity |  |  |  |  |  |
Amortized Cost | 156 |  | 152 |  |  |
Allowance for Credit Losses | (2) | (2) | (2) | (2) | 0 | 0
Unrealized Appreciation | 1 |  | 0 |  |  |
Unrealized Depreciation | (9) |  | (6) |  |  |
Fair Value | 146 |  | 144 |  |  |
Asset-backed Securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 5,326 |  | 4,229 |  |  |
Allowance for Credit Losses | 0 |  | 0 | 0 | 0 | (8)
Unrealized Appreciation | 15 |  | 5 |  |  |
Unrealized Depreciation | (69) |  | (171) |  |  |
Fair Value | 5,272 |  | 4,063 |  |  |
Fixed maturity securities - held to maturity |  |  |  |  |  |
Amortized Cost | 602 |  | 661 |  |  |
Allowance for Credit Losses | (5) | (6) | (6) | (6) | 0 | 0
Unrealized Appreciation | 3 |  | 2 |  |  |
Unrealized Depreciation | (18) |  | (15) |  |  |
Fair Value | 581 |  | 642 |  |  |
Commercial |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 1,143 |  | 1,023 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 0 |  | 0 |  |  |
Unrealized Depreciation | (124) |  | (105) |  |  |
Fair Value | 1,019 |  | 919 |  |  |
Fixed maturity securities - held to maturity |  |  |  |  |  |
Amortized Cost | 15 |  | 7 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 0 |  | 0 |  |  |
Unrealized Depreciation | 0 |  | 0 |  |  |
Fair Value | 15 |  | 7 |  |  |
Agency Residential |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 3,739 |  | 3,382 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 1 |  | 7 |  |  |
Unrealized Depreciation | (435) |  | (290) |  |  |
Fair Value | 3,305 |  | 3,099 |  |  |
Non-agency Residential |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 218 |  | 5 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 0 |  | 0 |  |  |
Unrealized Depreciation | (9) |  | (1) |  |  |
Fair Value | 209 |  | 4 |  |  |
Foreign government securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 1,844 |  | 1,586 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Unrealized Appreciation | 5 |  | 8 |  |  |
Unrealized Depreciation | (197) |  | (179) |  |  |
Fair Value | 1,651 |  | 1,415 |  |  |
Foreign corporate securities |  |  |  |  |  |
Fixed maturity securities - available for sale |  |  |  |  |  |
Amortized Cost | 5,557 |  | 5,143 |  |  |
Allowance for Credit Losses | (3) | (7) | (10) | (9) | (17) | (3)
Unrealized Appreciation | 12 |  | 23 |  |  |
Unrealized Depreciation | (531) |  | (562) |  |  |
Fair Value | 5,034 |  | 4,596 |  |  |
Fixed maturity securities - held to maturity |  |  |  |  |  |
Amortized Cost | 24 |  | 28 |  |  |
Allowance for Credit Losses | (1) | $ (1) | (1) | $ (1) | $ 0 | $ 0
Unrealized Appreciation | 1 |  | 2 |  |  |
Unrealized Depreciation | 0 |  | 0 |  |  |
Fair Value | $ 24 |  | $ 28 |  |  |

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