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Reinsurance - Narrative (Details) $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Oct. 01, 2023 agreement
--- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |
Number of reinsurance recoverable agreements | agreement |  |  | 2
Investments | $ 129,215 | $ 129,254 |
Fortitude Re |  |  |
Ceded Credit Risk [Line Items] |  |  |
Deposits assets | 8,200 | 8,100 |
Investments | 9,200 | 9,300 |
Fixed Annuities | Fortitude Re |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance recoverables | 10,600 | 10,600 |
Reinsurance recoverables on unpaid losses | 2,600 | 2,600 |
Reinsurance recoverable for unpaid claims and claims adjustments | 23 | 22 |
Deposits assets | $ 2,800 | $ 3,000 |

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