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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |
Reserve for losses and loss adjustment expenses at beginning of year |  | $ 29,369 | $ 22,752 | $ 20,032
Unpaid losses and loss adjustment expenses recoverable |  | 7,821 | 6,690 | 6,280
Net reserve for losses and loss adjustment expenses at beginning of year |  | 21,548 | 16,062 | 13,752
Net incurred losses and loss adjustment expenses relating to losses occurring in: |  |  |  |
Current year |  | 9,970 | 8,849 | 6,784
Prior years |  | (600) | (507) | (538)
Total net incurred losses and loss adjustment expenses |  | 9,370 | 8,342 | 6,246
Net losses and loss adjustment expense reserves of acquired business | [1] | 50 | 2,477 | 0
Foreign exchange (gains) losses and other |  | 550 | (260) | 157
Net paid losses and loss adjustment expenses relating to losses occurring in: |  |  |  |
Current year |  | (1,862) | (1,176) | (1,081)
Prior years |  | (5,163) | (3,897) | (3,012)
Total net paid losses and loss adjustment expenses |  | (7,025) | (5,073) | (4,093)
Net reserve for losses and loss adjustment expenses at end of year |  | 24,493 | 21,548 | 16,062
Unpaid losses and loss adjustment expenses recoverable |  | 9,054 | 7,821 | 6,690
Reserve for losses and loss adjustment expenses at end of year |  | $ 33,547 | $ 29,369 | $ 22,752
[1] | Activity in the 2025 and 2024 periods primarily related to the MCE Acquisition (see note 2).

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount, after deduction of reinsurance recovery, of increase (decrease) in cost of settling unpaid claim acquired in business combination. Includes, but is not limited to, claim incurred but not reported. + References No definition available. + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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