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Reinsurance - Narrative (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Oct. 01, 2023 agreement
--- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |
Number of reinsurance recoverable agreements | agreement |  |  | 2
Deposit assets, net of allowance for credit losses | $ 28,904 | $ 28,789 |
Investments | 125,702 | 124,331 |
Fortitude Re |  |  |
Ceded Credit Risk [Line Items] |  |  |
Deposits assets | 7,800 | 7,800 |
Investments | 9,800 | 9,900 |
Fixed Annuities | Fortitude Re |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance recoverables | 10,500 | 10,500 |
Reinsurance recoverables on unpaid losses | 2,700 | 2,700 |
Reinsurance recoverable for unpaid claims and claims adjustments | 22 |  |
Deposit assets, net of allowance for credit losses | $ 3,900 | $ 4,200 |

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