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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |  |
Deferred Policy Acquisition Costs |  | $ 4,260 | $ 4,244 | $ 4,161
Net Reserves for Unpaid Losses |  | 56,759 | 53,164 | 48,509
Unearned Premiums |  | 19,101 | 17,652 | 16,771
Net Premiums Earned |  | 35,035 | 31,800 | 30,189
Net Investment Income |  | 3,133 | 3,074 | 3,141
Current Year Claim and Claim Adjustment Expense |  | 22,966 | 22,124 | 19,575
Prior Year Claim and Claim Adjustment Expense |  | (986) | (414) | (845)
Net Losses and Loss Expenses Incurred Related to Prior Year | [1] | (986) | (414) | (845)
Amortization of Deferred Policy Acquisition Costs |  | 6,440 | 6,076 | 5,831
Net Paid Losses and Loss Expenses |  | 17,884 | 17,434 | 18,473
Net Premiums Written |  | $ 36,474 | $ 32,471 | $ 31,126
[1] | Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $60 million, $19 million, and $53 million for 2021, 2020, and 2019, respectively.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column H)(1)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount, after effect of reinsurance, of expense (reversal of expense) for claim incurred in prior reporting period and related claim settlement cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column H)(2)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of amortization expense on deferred policy acquisition cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of premium revenue earned by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column F)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of loss reported and paid for claim and claim adjustment expense by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column J)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of premium written by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column K)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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