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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net earned premiums $ 7,046 $ 7,036 $ 6,531
Net investment income 745 780 742
Other income 115 124 146
Revenues before realized gains (losses) 8,163 8,324 7,867
Realized gains (losses) on securities 10 0 (36)
Realized gains (losses) on subsidiaries 1 0 (4)
Total revenues 8,174 8,324 7,827
Operating segments | Property and casualty insurance      
Segment Reporting Information [Line Items]      
Net earned premiums 7,046 7,036 6,531
Net investment income 725 784 729
Other income 12 8 16
Revenues before realized gains (losses) 7,783 7,828 7,276
Operating segments | Other      
Segment Reporting Information [Line Items]      
Revenues before realized gains (losses) 380 496 591
Operating segments | Property and transportation | Property and casualty insurance      
Segment Reporting Information [Line Items]      
Net earned premiums 2,746 2,826 2,550
Operating segments | Specialty casualty | Property and casualty insurance      
Segment Reporting Information [Line Items]      
Net earned premiums 3,215 3,176 3,112
Operating segments | Specialty financial | Property and casualty insurance      
Segment Reporting Information [Line Items]      
Net earned premiums $ 1,085 $ 1,034 $ 869