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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information          
Earned premiums $ 2,297 $ 2,033 $ 6,524 $ 5,894  
Fee revenues 4 6 13 16  
Other 3 3 10 8  
Investment income, net of expenses 258 225 745 655  
Investment gains and losses, net 758 (456) 1,507 84  
Total revenues 3,320 1,811 8,799 6,657  
Income before Income Taxes 1,040 (148) 2,379 786  
Assets 37,009   37,009   $ 32,769
Operating Segments          
Segment Reporting Information          
Assets 6,223   6,223   5,294
Operating Segments | Commercial Insurance          
Segment Reporting Information          
Earned premiums 1,137 1,062 3,326 3,184  
Fee revenues 1 1 3 3  
Total revenues 1,138 1,063 3,329 3,187  
Income Before Income Taxes 81 52 130 83  
Operating Segments | Commercial Insurance | Commercial Casualty Line          
Segment Reporting Information          
Earned premiums 381 365 1,118 1,115  
Operating Segments | Commercial Insurance | Commercial Property Line          
Segment Reporting Information          
Earned premiums 361 321 1,045 933  
Operating Segments | Commercial Insurance | Commercial Auto Line          
Segment Reporting Information          
Earned premiums 231 216 679 644  
Operating Segments | Commercial Insurance | Workers' Compensation Line          
Segment Reporting Information          
Earned premiums 61 66 182 212  
Operating Segments | Commercial Insurance | Other Commercial Lines          
Segment Reporting Information          
Earned premiums 103 94 302 280  
Operating Segments | Personal Insurance          
Segment Reporting Information          
Earned premiums 678 527 1,897 1,484  
Fee revenues 2 1 4 3  
Total revenues 680 528 1,901 1,487  
Income Before Income Taxes (69) 1 (74) (92)  
Operating Segments | Personal Insurance | Personal Auto          
Segment Reporting Information          
Earned premiums 242 185 674 524  
Operating Segments | Personal Insurance | Home Owner Line          
Segment Reporting Information          
Earned premiums 352 271 981 755  
Operating Segments | Personal Insurance | Other Personal Lines          
Segment Reporting Information          
Earned premiums 84 71 242 205  
Operating Segments | Excess and Surplus Lines Insurance          
Segment Reporting Information          
Earned premiums 157 135 447 394  
Fee revenues 0 1 2 2  
Total revenues 157 136 449 396  
Income Before Income Taxes 8 14 28 38  
Operating Segments | Life Insurance Segment          
Segment Reporting Information          
Earned premiums 80 76 240 233  
Fee revenues 1 3 4 8  
Total revenues 81 79 244 241  
Income Before Income Taxes 10 17 42 38  
Assets 1,654   1,654   1,562
Operating Segments | Investment Segment          
Segment Reporting Information          
Investment income, net of expenses 258 225 745 655  
Investment gains and losses, net 758 (456) 1,507 84  
Total revenues 1,016 (231) 2,252 739  
Income Before Income Taxes 984 (262) 2,158 648  
Assets 27,640   27,640   24,999
Corporate, Non-Segment          
Segment Reporting Information          
Earned premiums 245 233 614 599  
Other 3 3 10 8  
Total revenues 248 236 624 607  
Income Before Income Taxes 26 $ 30 95 $ 71  
Assets $ 1,492   $ 1,492   $ 914