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Reinsurance and Indemnification - Schedule of Reinsurance and Indemnification Recoverables (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Reinsurance |  |  |  |
Reinsurance and indemnification recoverables, net | $ 9,013 | $ 8,809 |  |
Property and casualty |  |  |  |
Reinsurance |  |  |  |
Paid and due from reinsurers and indemnitors | 234 | 254 |  |
Unpaid losses estimated (including IBNR) | 8,728 | 8,396 | $ 8,654 | $ 9,176
Reinsurance and indemnification recoverables, net | 8,962 | 8,650 |  |
Accident and health insurance |  |  |  |
Reinsurance |  |  |  |
Reinsurance and indemnification recoverables, net | $ 51 | $ 159 |  |

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