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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
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Net earned premiums $ 1,609 $ 1,580
Losses and loss adjustment expenses 906 965
Commissions and other underwriting expenses 556 530
Operating segments | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Net earned premiums 1,609 1,580
Losses and loss adjustment expenses 906 965
Commissions and other underwriting expenses 547 521
Property and casualty insurance underwriting profit 156 94
Operating segments | Property and transportation | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Net earned premiums 526 500
Losses and loss adjustment expenses 301 311
Commissions and other underwriting expenses 160 152
Property and casualty insurance underwriting profit 65 37
Operating segments | Specialty casualty | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Net earned premiums 799 794
Losses and loss adjustment expenses 517 536
Commissions and other underwriting expenses 248 238
Property and casualty insurance underwriting profit 34 20
Operating segments | Specialty financial | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Net earned premiums 284 286
Losses and loss adjustment expenses 88 118
Commissions and other underwriting expenses 139 131
Property and casualty insurance underwriting profit $ 57 $ 37