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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | $ 6,784 | $ 5,797 | $ 4,940
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (538) | (769) | (355)
Consolidated Subsidiaries |  |  |
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Deferred Acquisition Costs | 1,531 | 1,263 | 901
Reserves for Losses and Loss Adjustment Expenses | 22,752 | 20,032 | 17,758
Discount, if any, deducted in Column C | 66 | 61 | 56
Unearned Premiums | 8,808 | 7,337 | 6,012
Net Premiums Earned | 12,440 | 9,679 | 8,082
Net investment income | 1,023 | 496 | 389
Net Losses and Loss Adjustment Expenses Incurred Related to Current Year | 6,784 | 5,797 | 4,940
Net Losses and Loss Adjustment Expenses Incurred Related to Prior Years | (538) | (769) | (355)
Amortization of Deferred Acquisition Costs | 2,312 | 1,740 | 1,303
Net Paid Losses and Loss Adjustment Expenses | 4,093 | 3,141 | 2,827
Net Premiums Written | $ 13,468 | $ 11,078 | $ 9,017

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