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RESERVE FOR LOSSES AND LAE - Schedule of 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
--- | --- | --- | --- | ---
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Total reinsurance recoverable on unpaid claims | $ 2,915 | $ 2,098 |  |
Insurance lines other than short-duration | 0 |  |  |
Unallocated claims adjustment expenses | 316 |  |  |
Other | 1,400 |  |  |
Total expenses | 1,716 |  |  |
Total gross liability for unpaid claims and claim adjustment expense | 29,889 | $ 24,604 | $ 22,065 | $ 19,009
Reinsurance And Insurance Segments |  |  |  |
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 25,491 |  |  |
Total reinsurance recoverable on unpaid claims | 2,683 |  |  |
Reinsurance | Property, Liability and Casualty Insurance Product Line |  |  |  |
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 12,810 |  |  |
Total reinsurance recoverable on unpaid claims | 73 |  |  |
Reinsurance | Property Insurance |  |  |  |
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 6,028 |  |  |
Total reinsurance recoverable on unpaid claims | 624 |  |  |
Insurance | Property, Liability and Casualty Insurance Product Line |  |  |  |
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 5,891 |  |  |
Total reinsurance recoverable on unpaid claims | 1,750 |  |  |
Insurance | Property Insurance |  |  |  |
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 762 |  |  |
Total reinsurance recoverable on unpaid claims | $ 237 |  |  |

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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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