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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | $ 8,849 | $ 6,784 | $ 5,797
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (507) | (538) | (769)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Acquisition Costs | 1,734 | 1,531 | 1,263
Reserves for Losses and Loss Adjustment Expenses | 29,369 | 22,752 | 20,032
Discount, if any, deducted in Column C | 68 | 66 | 61
Unearned Premiums | 10,218 | 8,808 | 7,337
Net Premiums Earned | 15,100 | 12,440 | 9,679
Net investment income | 1,495 | 1,023 | 496
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | 8,849 | 6,784 | 5,797
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (507) | (538) | (769)
Amortization of Deferred Acquisition Costs | 2,651 | 2,312 | 1,740
Net Paid Losses and Loss Adjustment Expenses | 5,073 | 4,093 | 3,141
Net Premiums Written | $ 15,732 | $ 13,468 | $ 11,078

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