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INVESTMENTS - Summary of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | $ 25,247 | $ 24,191 |  |
Allowance for Credit Losses | (62) | (54) | $ (42) | $ (30)
Unrealized Appreciation | 91 | 81 |  |
Unrealized Depreciation | (1,716) | (1,982) |  |
Fair Value | 23,560 | 22,236 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 834 | 848 |  |
Allowance for Credit Losses | (9) | (9) |  |
Unrealized Appreciation | 4 | 3 |  |
Unrealized Depreciation | (15) | (22) |  |
Fair Value | 814 | 821 |  |
U.S. Treasury securities and obligations of U.S. government agencies and corporations |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 1,323 | 1,334 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 5 | 6 |  |
Unrealized Depreciation | (69) | (82) |  |
Fair Value | 1,259 | 1,257 |  |
Obligations of U.S. states and political subdivisions |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 424 | 444 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 2 | 2 |  |
Unrealized Depreciation | (30) | (32) |  |
Fair Value | 396 | 413 |  |
Corporate securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 7,202 | 7,044 |  |
Allowance for Credit Losses | (55) | (45) | (20) | (19)
Unrealized Appreciation | 29 | 31 |  |
Unrealized Depreciation | (497) | (561) |  |
Fair Value | 6,679 | 6,469 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 152 | 152 |  |
Allowance for Credit Losses | (2) | (2) |  |
Unrealized Appreciation | 1 | 0 |  |
Unrealized Depreciation | (3) | (6) |  |
Fair Value | 148 | 144 |  |
Asset-backed securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 4,567 | 4,229 |  |
Allowance for Credit Losses | 0 | 0 | (8) | (8)
Unrealized Appreciation | 5 | 5 |  |
Unrealized Depreciation | (129) | (171) |  |
Fair Value | 4,443 | 4,063 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 640 | 661 |  |
Allowance for Credit Losses | (6) | (6) |  |
Unrealized Appreciation | 1 | 2 |  |
Unrealized Depreciation | (12) | (15) |  |
Fair Value | 624 | 642 |  |
Commercial |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 1,075 | 1,023 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 1 | 0 |  |
Unrealized Depreciation | (102) | (105) |  |
Fair Value | 974 | 919 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 14 | 7 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 0 | 0 |  |
Unrealized Depreciation | 0 | 0 |  |
Fair Value | 14 | 7 |  |
Agency residential |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 3,690 | 3,382 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 19 | 7 |  |
Unrealized Depreciation | (244) | (290) |  |
Fair Value | 3,465 | 3,099 |  |
Non-agency residential |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 5 | 5 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 0 | 0 |  |
Unrealized Depreciation | (1) | (1) |  |
Fair Value | 4 | 4 |  |
Foreign government securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 1,616 | 1,586 |  |
Allowance for Credit Losses | 0 | 0 |  |
Unrealized Appreciation | 8 | 8 |  |
Unrealized Depreciation | (153) | (179) |  |
Fair Value | 1,471 | 1,415 |  |
Foreign corporate securities |  |  |  |
Fixed maturity securities - available for sale |  |  |  |
Amortized Cost | 5,345 | 5,143 |  |
Allowance for Credit Losses | (7) | (10) | $ (14) | $ (3)
Unrealized Appreciation | 22 | 23 |  |
Unrealized Depreciation | (491) | (562) |  |
Fair Value | 4,869 | 4,596 |  |
Fixed maturity securities - held to maturity |  |  |  |
Amortized Cost | 28 | 28 |  |
Allowance for Credit Losses | (1) | (1) |  |
Unrealized Appreciation | 2 | 2 |  |
Unrealized Depreciation | 0 | 0 |  |
Fair Value | $ 29 | $ 28 |  |

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