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Segment Information - Operating Results (Detail) - 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 premiums earned $ 20,849 $ 18,297 $ 60,568 $ 51,655
Fees and other revenues 306 278 896 774
Total underwriting revenue 21,155 18,575 61,464 52,429
Losses (excluding catastrophe losses) 11,377 10,120 33,179 29,002
Catastrophe losses 219 732 1,385 2,348
Loss adjustment expenses 1,849 1,658 5,290 4,727
Losses and loss adjustment expenses 13,445 12,510 39,854 36,077
Distribution expenses 2,821 2,564 8,092 6,510
Other underwriting expenses 2,699 1,496 5,803 4,201
Total underwriting expenses 5,520 4,060 13,895 10,711
Pretax underwriting profit (loss) 2,190 2,005 7,715 5,641
Investment profit (loss) 1,209 1,020 3,053 2,339
Service businesses profit (loss) (6) (9) (18) (25)
Interest expense (70) (70) (209) (209)
Income before income taxes 3,323 2,946 10,541 7,746
Policyholder credit expense [1] 950 0 950 0
FLORIDA        
Segment Reporting Information [Line Items]        
Policyholder credit expense 950   950  
Operating Segments | Personal Lines | Underwriting operations        
Segment Reporting Information [Line Items]        
Net premiums earned 18,089 15,570 52,343 43,706
Fees and other revenues 272 235 784 647
Total underwriting revenue 18,361 15,805 53,127 44,353
Losses (excluding catastrophe losses) 9,801 8,514 28,484 24,225
Catastrophe losses 207 698 1,349 2,279
Loss adjustment expenses 1,554 1,382 4,415 3,903
Losses and loss adjustment expenses 11,562 10,594 34,248 30,407
Distribution expenses 2,507 2,267 7,183 5,655
Other underwriting expenses 2,394 1,245 4,967 3,468
Total underwriting expenses 4,901 3,512 12,150 9,123
Pretax underwriting profit (loss) 1,898 1,699 6,729 4,823
Operating Segments | Commercial Lines | Underwriting operations        
Segment Reporting Information [Line Items]        
Net premiums earned 2,760 2,727 8,224 7,949
Fees and other revenues 34 43 112 127
Total underwriting revenue 2,794 2,770 8,336 8,076
Losses (excluding catastrophe losses) 1,575 1,607 4,695 4,781
Catastrophe losses 12 34 36 69
Loss adjustment expenses 296 276 875 824
Losses and loss adjustment expenses 1,883 1,917 5,606 5,674
Distribution expenses 313 297 907 855
Other underwriting expenses 300 248 823 726
Total underwriting expenses 613 545 1,730 1,581
Pretax underwriting profit (loss) 298 308 1,000 821
Operating Segments | Other Indemnity | Underwriting operations        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 1 0
Fees and other revenues 0 0 0 0
Total underwriting revenue 0 0 1 0
Losses (excluding catastrophe losses) 1 (1) 0 (4)
Catastrophe losses 0 0 0 0
Loss adjustment expenses (1) 0 0 0
Losses and loss adjustment expenses 0 (1) 0 (4)
Distribution expenses 1 0 2 0
Other underwriting expenses 5 3 13 7
Total underwriting expenses 6 3 15 7
Pretax underwriting profit (loss) $ (6) $ (2) $ (14) $ (3)
[1] See Note 8 – Segment Information for further discussion.