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Unpaid losses and loss expenses (RF) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Gross unpaid losses and loss expenses – beginning of period |  | $ 80,122 | $ 75,747
Reinsurance recoverable on unpaid losses and loss expenses – beginning of period (1) | [1] | (17,884) | (17,086)
Net unpaid losses and loss expenses – beginning of period |  | 62,238 | 58,661
Current Year Claims and Claims Adjustment Expense |  | 20,302 | 18,604
Prior Year Claims and Claims Adjustment Expense | [2] | (761) | (667)
Total, Incurred |  | 19,541 | 17,937
Net loss and loss expenses paid, Current Year |  | 5,005 | 4,853
Net loss and loss expenses paid, Prior Years |  | 10,074 | 10,158
Total, Paid |  | 15,079 | 15,011
Foreign currency revaluation and other |  | (5) | (95)
Net unpaid losses and loss expenses – end of period |  | 66,695 | 61,897
Reinsurance recoverable on unpaid losses and loss expenses (1) | [1] | 17,631 | 17,808
Gross unpaid losses and loss expenses – end of period |  | 84,326 | 79,705
prior period development, net adjustments |  | 118 | 71
Huatai Group |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Net unpaid losses and loss expenses – end of period |  | $ 0 | $ 405
[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 A&H long-duration lines totaling $118 million and $71 million for the nine months ended September 30, 2024 and 2023, 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://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 2: 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 3: 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 4: 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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