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Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Total investment income | $ 1,027 | $ 890 | $ 2,059 | $ 1,781
Investment expenses | 37 | 53 | 90 | 100
Net investment income | 990 | 837 | 1,969 | 1,681
Change in fair value of equity method investment | 59 | 41 | 147 | 62
Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 994 | 865 | 1,987 | 1,704
Investment expenses | 37 | 53 | 90 | 100
Net investment income | 957 | 812 | 1,897 | 1,604
Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 33 | 25 | 72 | 77
Investment expenses | 0 | 0 | 0 | 0
Net investment income | 33 | 25 | 72 | 77
Corebridge Financial Inc |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Dividend income | 68 |  | 68 |
Change in fair value of equity method investment | 65 |  | 65 |
Available for sale fixed maturity securities, including short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 743 | 738 | 1,530 | 1,404
Available for sale fixed maturity securities, including short-term investments | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 723 | 714 | 1,488 | 1,354
Available for sale fixed maturity securities, including short-term investments | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 20 | 24 | 42 | 50
Other fixed maturity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 5 | (11) | 7 | 9
Other fixed maturity securities | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 1 | (1) | (4) | 2
Other fixed maturity securities | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 4 | (10) | 11 | 7
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | (4) | 41 | 84 | 62
Equity securities | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | (4) | 41 | 84 | 62
Equity securities | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 0 | 0 | 0 | 0
Interest on mortgage and other loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 73 | 82 | 150 | 157
Interest on mortgage and other loans | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 65 | 73 | 133 | 139
Interest on mortgage and other loans | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 8 | 9 | 17 | 18
Alternative investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 32 | 44 | 86 | 139
Alternative investments | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 32 | 44 | 87 | 139
Alternative investments | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 0 | 0 | (1) | 0
Other investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 178 | (4) | 202 | 10
Other investments | Excluding Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 177 | (6) | 199 | 8
Other investments | Fortitude Re Funds Withheld Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | $ 1 | $ 2 | $ 3 | $ 2

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