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Property Casualty Loss and Loss Expense - Reconciliation of Incurred Losses and ALAE (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | $ 3,496 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 8,535 |  |  |
Reinsurance recoverable on unpaid losses | 362 | $ 405 | $ 327 | $ 277
Unallocated loss adjustment expense reserves | 440 |  |  |
Total liabilities for gross loss and loss expense reserves | 8,975 | $ 8,336 | $ 7,229 | $ 6,677
Other Short-duration Insurance Product Line |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 1,686 |  |  |
Commercial Insurance | Commercial Casualty Line |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 6,497 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 3,680 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 91 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 2,908 |  |  |
Reinsurance recoverable on unpaid losses | 19 |  |  |
Total liabilities for gross loss and loss expense reserves | 2,927 |  |  |
Commercial Insurance | Workers' Compensation Line |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 1,826 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 1,160 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 316 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 982 |  |  |
Reinsurance recoverable on unpaid losses | 54 |  |  |
Total liabilities for gross loss and loss expense reserves | 1,036 |  |  |
Commercial Insurance | Commercial Auto Line |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 2,432 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 1,657 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 32 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 807 |  |  |
Reinsurance recoverable on unpaid losses | 4 |  |  |
Total liabilities for gross loss and loss expense reserves | 811 |  |  |
Commercial Insurance | Commercial Property Line |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 3,496 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 3,033 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 12 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 475 |  |  |
Reinsurance recoverable on unpaid losses | 50 |  |  |
Total liabilities for gross loss and loss expense reserves | 525 |  |  |
Personal Insurance | Personal Auto |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 1,884 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 1,594 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 12 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 302 |  |  |
Reinsurance recoverable on unpaid losses | 25 |  |  |
Total liabilities for gross loss and loss expense reserves | 327 |  |  |
Personal Insurance | Homeowner |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 2,576 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 2,231 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 6 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 351 |  |  |
Reinsurance recoverable on unpaid losses | (3) |  |  |
Total liabilities for gross loss and loss expense reserves | 348 |  |  |
Excess and Surplus Lines Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance | 1,545 |  |  |
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance | 707 |  |  |
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance | 4 |  |  |
Total liabilities for loss and ALAE, net of reinsurance | 842 |  |  |
Reinsurance recoverable on unpaid losses | 33 |  |  |
Total liabilities for gross loss and loss expense reserves | $ 875 |  |  |

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