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Supplementary Insurance Information - Table (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs $ 333 $ 320 $ 309
Reserves for claims and unpaid losses and LAE 15,094 14,179 13,087
Unearned premiums 3,736 3,584 3,451
Net earned premiums 7,046 7,036 6,531
Net investment income 745 780 742
Claims, losses and settlement expenses 4,388 4,460 4,033
Amortization of deferred policy acquisition costs 775 766 720
Other operating expenses 1,938 1,974 2,001
Net written premiums 7,110 7,139 6,692
Property and casualty insurance      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs 333 320 309
Reserves for claims and unpaid losses and LAE 15,094 14,179 13,087
Unearned premiums 3,736 3,584 3,451
Net earned premiums 7,046 7,036 6,531
Net investment income 725 784 729
Claims, losses and settlement expenses 4,388 4,455 4,017
Amortization of deferred policy acquisition costs 775 766 720
Other operating expenses 1,333 1,279 1,235
Net written premiums 7,110 7,139 6,692
Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Net investment income 20 (4) 13
Claims, losses and settlement expenses   5 16
Other operating expenses $ 605 $ 695 $ 766