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Reinsurance and Indemnification - Schedule of Reinsurance and Indemnification Recoverables (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Reinsurance |  |  |  |
Reinsurance and indemnification recoverables, net | $ 10,091 | $ 8,924 |  |
Property and casualty |  |  |  |
Reinsurance |  |  |  |
Paid and due from reinsurers and indemnitors | 352 | 285 |  |
Unpaid losses estimated (including IBNR) | 9,739 | 8,602 | $ 8,333 | $ 8,396
Reinsurance and indemnification recoverables, net | 10,091 | 8,887 |  |
Accident and health insurance |  |  |  |
Reinsurance |  |  |  |
Reinsurance and indemnification recoverables, net | $ 0 | $ 37 |  |

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