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Schedule VI (SUPPLEMENTARY INFORMATION CONCERNING PROPERTY AND CASUALTY OPERATIONS) (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 [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 3,346 | $ 2,877 | $ 2,718
Net Reserves for Unpaid Losses | 62,238 | 58,661 | 56,198
Unearned Premiums | 22,051 | 19,713 | 18,496
Net Premiums Earned | 40,314 | 36,850 | 33,953
Net Investment Income | 4,181 | 3,233 | 3,049
Current Year Claim and Claim Adjustment Expense | 24,956 | 23,680 | 21,986
Prior Year Claim and Claim Adjustment Expense | (856) | (1,108) | (956)
Net Losses and Loss Expenses Incurred Related to Prior Year | (882) |  |
Amortization of Deferred Policy Acquisition Costs | 7,391 | 6,480 | 5,945
Net Paid Losses and Loss Expenses | 21,011 | 19,537 | 16,948
Net Premiums Written | $ 41,896 | $ 38,112 | $ 35,391

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- Definition Amount, after effect of reinsurance, of expense for claim incurred in current reporting period and related claim settlement cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column H)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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