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Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Net Investment Income [Line Items] |  |
Total investment income | $ 1,143 | $ 1,032
Investment expenses | 38 | 53
Net investment income | 1,105 | 979
Change in fair value of equity method investment | 217 | 88
Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 1,103 | 993
Investment expenses | 38 | 53
Net investment income | 1,065 | 940
Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 40 | 39
Investment expenses | 0 | 0
Net investment income | 40 | 39
Corebridge Financial Inc |  |
Net Investment Income [Line Items] |  |
Dividend income | 31 |
Change in fair value of equity method investment | 209 |
Available for sale fixed maturity securities, including short-term investments |  |
Net Investment Income [Line Items] |  |
Total investment income | 812 | 787
Available for sale fixed maturity securities, including short-term investments | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 790 | 765
Available for sale fixed maturity securities, including short-term investments | Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 22 | 22
Other fixed maturity securities |  |
Net Investment Income [Line Items] |  |
Total investment income | 11 | 2
Other fixed maturity securities | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 0 | (5)
Other fixed maturity securities | Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 11 | 7
Equity securities |  |
Net Investment Income [Line Items] |  |
Total investment income | 9 | 88
Equity securities | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 9 | 88
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 | 51 | 77
Interest on mortgage and other loans | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 44 | 68
Interest on mortgage and other loans | Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 7 | 9
Alternative investments |  |
Net Investment Income [Line Items] |  |
Total investment income | 43 | 54
Alternative investments | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 43 | 55
Alternative investments | Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 0 | (1)
Other investments |  |
Net Investment Income [Line Items] |  |
Total investment income | 217 | 24
Other investments | Excluding Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | 217 | 22
Other investments | Fortitude Re Funds Withheld Assets |  |
Net Investment Income [Line Items] |  |
Total investment income | $ 0 | $ 2

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