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Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | $ 90,682 | $ 88,738 |  |
Other investments | 5,743 | 5,015 |  |
Cash and invested cash | 6,013 | 3,365 | $ 2,529 | $ 3,343
Accrued investment income | 1,160 | 1,082 |  |
Other assets | 8,454 | 9,311 |  |
Fortitude Re |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | 8,484 | 8,867 |  |
Other investments | 1,178 | 759 |  |
Cash and invested cash | 82 | 141 |  |
Accrued investment income | 100 | 103 |  |
Other assets | 0 | 1 |  |
Total | $ 9,844 | $ 9,871 |  |

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