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Unpaid losses and loss expenses (RF) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Unpaid Losses and Loss Expenses [Roll Forward] |  |  |
Gross unpaid losses and loss expenses – beginning of period |  | $ 75,747 | $ 72,330
Reinsurance recoverable on unpaid losses – beginning of period (1) | [1] | (17,086) | (16,132)
Net unpaid losses and loss expenses – beginning of period |  | 58,661 | 56,198
Current Year Claims and Claims Adjustment Expense |  | 18,604 | 17,755
Prior Year Claims and Claims Adjustment Expense | [2] | (667) | (922)
Total, Incurred |  | 17,937 | 16,833
Net loss and loss expenses paid, Current Year |  | 4,853 | 4,511
Net loss and loss expenses paid, Prior Years |  | 10,158 | 9,217
Total, Paid |  | 15,011 | 13,728
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other |  | (95) | (1,280)
Net unpaid losses and loss expenses – end of period |  | 61,897 | 58,023
Reinsurance recoverable on unpaid losses (1) | [1] | 17,808 | 17,313
Gross unpaid losses and loss expenses – end of period |  | 79,705 | 75,336
prior period development, net adjustments |  | 71 | $ 213
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Gross |  | 4,000 |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) |  | $ 3,200 |
[1] | Net of valuation allowance for uncollectible reinsurance.
[2] | Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and development on international A&H lines totaling $71 million and $213 million for the nine months ended September 30, 2023 and 2022, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + 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//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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