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Reinsurance - Consolidated Property Casualty Insurance Assumed and Ceded Business (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Property Casualty Insurance Assumed And Ceded Business        
Earned premiums $ 2,567 $ 2,297 $ 7,391 $ 6,524
Incurred loss and loss expenses 1,540 1,578 5,168 4,407
Consolidated Property And Casualty Insurance        
Property Casualty Insurance Assumed And Ceded Business        
Direct written premiums 2,482 2,285 7,542 6,772
Assumed written premiums 98 102 597 577
Ceded written premiums (87) (94) (418) (349)
Net written premiums 2,493 2,293 7,721 7,000
Direct earned premiums 2,440 2,179 7,020 6,128
Assumed earned premiums 162 159 514 466
Ceded earned premiums (118) (121) (389) (310)
Earned premiums 2,484 2,217 7,145 6,284
Direct incurred loss and loss expenses 1,408 1,415 5,065 3,960
Assumed incurred loss and loss expenses 78 103 405 242
Ceded incurred loss and loss expenses (22) (19) (532) (21)
Incurred loss and loss expenses $ 1,464 $ 1,499 $ 4,938 $ 4,181