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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- Definition Line items represent financial concepts included in a table. 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