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Property Casualty Loss and Loss Expense - Reconciliation of Incurred Losses and ALAE (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Liability for Claims and Claims Adjustment Expense  
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance $ 3,589
Total liabilities for loss and ALAE, net of reinsurance 9,416
Unallocated loss adjustment expense reserves 521
Total liabilities for gross loss and loss expense reserves 9,937
Other Short-duration Insurance Product Line  
Liability for Claims and Claims Adjustment Expense  
Total liabilities for loss and ALAE, net of reinsurance 1,905
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 7,025
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 3,921
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 124
Total liabilities for loss and ALAE, net of reinsurance 3,228
Reinsurance recoverable on unpaid losses 20
Total liabilities for gross loss and loss expense reserves 3,248
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 1,746
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 1,105
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 326
Total liabilities for loss and ALAE, net of reinsurance 967
Reinsurance recoverable on unpaid losses 53
Total liabilities for gross loss and loss expense reserves 1,020
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 2,514
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 1,683
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 40
Total liabilities for loss and ALAE, net of reinsurance 871
Reinsurance recoverable on unpaid losses 3
Total liabilities for gross loss and loss expense reserves 874
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 3,589
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 3,134
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 14
Total liabilities for loss and ALAE, net of reinsurance 469
Reinsurance recoverable on unpaid losses 24
Total liabilities for gross loss and loss expense reserves 493
Personal Insurance | Personal Auto  
Liability for Claims and Claims Adjustment Expense  
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance 2,115
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 1,739
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 13
Total liabilities for loss and ALAE, net of reinsurance 389
Reinsurance recoverable on unpaid losses 21
Total liabilities for gross loss and loss expense reserves 410
Personal Insurance | Homeowner  
Liability for Claims and Claims Adjustment Expense  
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance 2,946
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 2,540
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance 8
Total liabilities for loss and ALAE, net of reinsurance 414
Reinsurance recoverable on unpaid losses 9
Total liabilities for gross loss and loss expense reserves 423
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 1,862
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance 855
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 1,013
Reinsurance recoverable on unpaid losses 30
Total liabilities for gross loss and loss expense reserves $ 1,043