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Segments of Operations - Revenues 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
Net investment income 205 200 562 586
Other income 30 26 84 92
Revenues before realized gains (losses) 2,318 2,371 6,093 6,165
Realized gains (losses) on securities 12 (2) 17 10
Realized gain on subsidiaries 1 0 1 0
Total revenues 2,331 2,369 6,111 6,175
Operating segments | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net earned premiums 2,013 2,055 5,240 5,186
Net investment income 205 195 554 589
Other income 6 2 9 6
Revenues before realized gains (losses) 2,224 2,252 5,803 5,781
Operating segments | Property and Casualty Insurance | Property and transportation        
Segment Reporting Information [Line Items]        
Net earned premiums 935 989 2,011 2,061
Operating segments | Property and Casualty Insurance | Specialty casualty        
Segment Reporting Information [Line Items]        
Net earned premiums 810 797 2,403 2,371
Operating segments | Property and Casualty Insurance | Specialty financial        
Segment Reporting Information [Line Items]        
Net earned premiums 268 269 826 754
Operating segments | Other        
Segment Reporting Information [Line Items]        
Revenues before realized gains (losses) $ 94 $ 119 $ 290 $ 384