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Segments of Operations - Components of underwriting profit, including significant segment expenses by segment and sub-segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net earned premiums $ 2,013 $ 2,055 $ 5,240 $ 5,186
Losses and loss adjustment expenses 1,355 1,430 3,327 3,279
Commissions and other underwriting expenses 529 518 1,593 1,527
Operating segments | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net earned premiums 2,013 2,055 5,240 5,186
Losses and loss adjustment expenses 1,355 1,430 3,327 3,274
Commissions and other underwriting expenses 520 510 1,568 1,494
Property and casualty insurance underwriting profit 138 115 345 418
Operating segments | Property and transportation | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net earned premiums 935 989 2,011 2,061
Losses and loss adjustment expenses 728 784 1,426 1,441
Commissions and other underwriting expenses 152 172 466 487
Property and casualty insurance underwriting profit 55 33 119 133
Operating segments | Specialty casualty | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net earned premiums 810 797 2,403 2,371
Losses and loss adjustment expenses 541 519 1,593 1,504
Commissions and other underwriting expenses 236 215 708 657
Property and casualty insurance underwriting profit 33 63 102 210
Operating segments | Specialty financial | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net earned premiums 268 269 826 754
Losses and loss adjustment expenses 85 125 306 325
Commissions and other underwriting expenses 132 123 394 350
Property and casualty insurance underwriting profit 51 21 126 79
Operating segments | Other lines | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Losses and loss adjustment expenses 1 2 2 4
Property and casualty insurance underwriting profit $ (1) $ (2) $ (2) $ (4)