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Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | $ 87,111 | $ 88,738 |  |
Trading securities | 2,025 | 2,359 |  |
Equity securities | 294 | 306 |  |
Mortgage loans on real estate | 21,083 | 18,963 |  |
Derivative investments | 9,677 | 6,474 |  |
Other investments | 6,588 | 5,015 |  |
Cash and invested cash | 5,801 | 3,365 | $ 3,343 | $ 2,612
Accrued investment income | 1,108 | 1,082 |  |
Other assets | 8,163 | 8,853 |  |
Fortitude Re |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | 7,764 | 8,867 |  |
Derivative investments | 30 | 0 |  |
Other investments | 1,419 | 759 |  |
Cash and invested cash | 28 | 141 |  |
Accrued investment income | 96 | 103 |  |
Other assets | 0 | 1 |  |
Total | 9,337 | 9,871 |  |
Athene Holding Ltd. |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fixed maturity AFS securities | 142 | 177 |  |
Trading securities | 1,385 | 1,556 |  |
Equity securities | 42 | 58 |  |
Mortgage loans on real estate | 232 | 288 |  |
Derivative investments | 46 | 43 |  |
Other investments | 54 | 41 |  |
Cash and invested cash | 147 | 582 |  |
Accrued investment income | 18 | 23 |  |
Other assets | 1 | 6 |  |
Total | $ 2,067 | $ 2,774 |  |

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