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Insurance Liabilities - Reconciliation of the Net Incurred and Paid Claims Development (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | $ 40,142 | $ 40,104 | $ 43,065 | $ 43,813
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 29,026 | 30,289 | 32,102 | 35,213
Liability for unpaid losses and loss adjustment expenses | 69,168 | 70,393 | $ 75,167 | $ 79,026
Reinsurance recoverables | 40,500 | $ 41,400 |  |
Discount on workers' compensation lines | Reconciling Items |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses | (2,111) |  |  |
Other product lines | Reconciling Items |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 7,000 |  |  |
Liability for unpaid losses and loss adjustment expenses | 15,384 |  |  |
Reinsurance recoverables | 8,400 |  |  |
Unallocated loss adjustment expenses | Reconciling Items |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses | 2,688 |  |  |
Reportable Subsegments |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 32,522 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 20,685 |  |  |
Liability for unpaid losses and loss adjustment expenses | 53,207 |  |  |
Reportable Subsegments | U.S. Workers' Compensation (before discount) |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 3,468 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 4,852 |  |  |
Liability for unpaid losses and loss adjustment expenses | 8,320 |  |  |
Reportable Subsegments | U.S. Excess Casualty |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 3,208 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 3,139 |  |  |
Liability for unpaid losses and loss adjustment expenses | 6,347 |  |  |
Reportable Subsegments | U.S. Other Casualty |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 4,387 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 3,416 |  |  |
Liability for unpaid losses and loss adjustment expenses | 7,803 |  |  |
Reportable Subsegments | U.S. Financial Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 5,422 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 1,614 |  |  |
Liability for unpaid losses and loss adjustment expenses | 7,036 |  |  |
Reportable Subsegments | U.S. Property and Special Risks |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 4,297 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 1,233 |  |  |
Liability for unpaid losses and loss adjustment expenses | 5,530 |  |  |
Reportable Subsegments | U.S. Personal Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 836 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 2,048 |  |  |
Liability for unpaid losses and loss adjustment expenses | 2,884 |  |  |
Reportable Subsegments | UK/Europe Casualty and Financial lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 7,280 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 1,952 |  |  |
Liability for unpaid losses and loss adjustment expenses | 9,232 |  |  |
Reportable Subsegments | UK/Europe Property and Special Risks |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 2,355 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 1,761 |  |  |
Liability for unpaid losses and loss adjustment expenses | 4,116 |  |  |
Reportable Subsegments | UK/Europe and Japan Personal Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | 1,269 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | 670 |  |  |
Liability for unpaid losses and loss adjustment expenses | $ 1,939 |  |  |

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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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- 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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