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Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |
Total investment income | $ 4,434 | $ 3,681 | $ 2,550
Investment expenses | 179 | 235 | 180
Net investment income | 4,255 | 3,446 | 2,370
Change in fair value of equity method investment | 586 | 53 | 29
Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 4,290 | 3,501 | 2,497
Investment expenses | 179 | 235 | 180
Net investment income | 4,111 | 3,266 | 2,317
Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 144 | 180 | 53
Investment expenses | 0 | 0 |
Net investment income | 144 | 180 | 53
Corebridge Financial Inc |  |  |
Net Investment Income [Line Items] |  |  |
Dividend income | 162 |  |
Change in fair value of equity method investment | 439 |  |
Available for sale fixed maturity securities, including short-term investments |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 3,078 | 2,957 | 2,073
Available for sale fixed maturity securities, including short-term investments | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 2,989 | 2,862 | 1,960
Available for sale fixed maturity securities, including short-term investments | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 89 | 95 | 113
Other fixed maturity securities |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 19 | 46 | (374)
Gains/(losses) recognized in earnings on hedging derivatives |  |  | (195)
Other fixed maturity securities | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 0 | 3 | (282)
Other fixed maturity securities | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 19 | 43 | (92)
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 149 | 53 | 29
Equity securities | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 149 | 53 | 29
Equity securities | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 0 | 0 |
Interest on mortgage and other loans |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 261 | 321 | 291
Interest on mortgage and other loans | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 229 | 283 | 264
Interest on mortgage and other loans | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 32 | 38 | 27
Alternative investments |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 196 | 199 | 315
Alternative investments | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 196 | 199 | 315
Alternative investments | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 0 | 0 |
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 731 | 105 | 216
Gains/(losses) recognized in earnings on hedging derivatives |  |  | 186
Other investments | Excluding Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | 727 | 101 | 211
Other investments | Fortitude Re Funds Withheld Assets |  |  |
Net Investment Income [Line Items] |  |  |
Total investment income | $ 4 | $ 4 | $ 5

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