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Insurance - Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance |  |  |  |
Balance at beginning of period | $ 14,179 | $ 13,087 | $ 11,974 | $ 11,074
Less reinsurance recoverables, net of allowance | 4,957 | 4,288 | 3,767 | 3,419
Net liability at beginning of period | 8,799 | 8,207 | 7,655 |
Provision for losses and LAE occurring in the current year | 4,524 | 4,256 | 3,914 |
Net increase (decrease) in the provision for claims of prior years: |  |  |  |
Total losses and LAE incurred | 4,460 | 4,033 | 3,629 |
Payments for losses and LAE of: |  |  |  |
Current year | (1,497) | (1,261) | (1,212) |
Prior years | (2,537) | (2,181) | (1,870) |
Total payments | (4,034) | (3,442) | (3,082) |
Foreign currency translation and other | (3) | 1 | 5 |
Net liability at end of period | 9,222 | 8,799 | 8,207 |
Add back reinsurance recoverables, net of allowance | 4,957 | 4,288 | 3,767 |
Unpaid losses and loss adjustment expenses | 14,179 | 13,087 | 11,974 | $ 11,074
Net decrease in the provision for claims of prior years |  |  |  |
Net increase (decrease) in the provision for claims of prior years: |  |  |  |
Prior year claims and claims adjustment expense | $ (64) | $ (223) | $ (285) |

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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + 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/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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- Definition Amount of foreign currency gain (loss) which decreases (increases) the cost of settling unpaid claims after deduction of reinsurance recoveries. Includes, but is not limited to, claims which have been 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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