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Segments of Operations - Revenues 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
Net investment income 187 173
Other income 29 27
Revenues before realized gains (losses) 1,872 1,853
Realized gains (losses) on securities (18) 3
Total revenues 1,854 1,856
Operating segments | Property and Casualty Insurance    
Segment Reporting Information [Line Items]    
Net earned premiums 1,609 1,580
Net investment income 168 170
Other income 4 3
Revenues before realized gains (losses) 1,781 1,753
Operating segments | Property and Casualty Insurance | Property and transportation    
Segment Reporting Information [Line Items]    
Net earned premiums 526 500
Operating segments | Property and Casualty Insurance | Specialty casualty    
Segment Reporting Information [Line Items]    
Net earned premiums 799 794
Operating segments | Property and Casualty Insurance | Specialty financial    
Segment Reporting Information [Line Items]    
Net earned premiums 284 286
Operating segments | Other    
Segment Reporting Information [Line Items]    
Revenues before realized gains (losses) $ 91 $ 100