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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year $ 9,970 $ 8,849 $ 6,784
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (600) (507) (538)
Consolidated Subsidiaries      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Acquisition Costs 1,717 1,734 1,531
Reserves for Losses and Loss Adjustment Expenses 33,547 29,369 22,752
Discount, if any, deducted in Column C 78 68 66
Unearned Premiums 10,100 10,218 8,808
Net Premiums Earned 17,065 15,100 12,440
Net investment income 1,625 1,495 1,023
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year 9,970 8,849 6,784
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years (600) (507) (538)
Amortization of Deferred Acquisition Costs 3,153 2,651 2,312
Net Paid Losses and Loss Adjustment Expenses 7,025 5,073 4,093
Net Premiums Written $ 16,476 $ 15,732 $ 13,468