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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 5,276,672	$ 4,926,309
ACR	2,110,214	2,200,627
IBNR	15,325,974	14,176,555
Total	22,712,860	21,303,491	$ 21,221,194
Operating Segments | Property
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,910,587	1,845,228
ACR	1,833,077	1,905,553
IBNR	2,516,670	2,821,958
Total	6,260,334	6,572,739
Operating Segments | Casualty and Specialty
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	3,366,085	3,081,081
ACR	277,137	295,074
IBNR	12,809,304	11,354,597
Total	$ 16,452,526	$ 14,730,752

X

- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Additional Case Reserves, Amount

+ References

No definition available.

+ Details

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X

- 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 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-11

Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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-Section 55
-Paragraph 9E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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Reference 5: 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement.

+ References

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- Definition

Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement.

+ References

No definition available.

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