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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Claims and Claim Expense Reserves by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 3,979,089	$ 3,821,053
Additional Case Reserves	2,278,745	2,176,884
IBNR	9,880,294	9,894,636
Gross reserve for claims and claim expenses	16,138,128	15,892,573	$ 13,442,806
Property | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	2,011,450	1,956,688
Additional Case Reserves	2,074,234	2,008,891
IBNR	2,847,946	3,570,253
Gross reserve for claims and claim expenses	6,933,630	7,535,832
Casualty and Specialty | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,967,639	1,864,365
Additional Case Reserves	204,511	167,993
IBNR	7,032,348	6,324,383
Gross reserve for claims and claim expenses	$ 9,204,498	$ 8,356,741

X

- Definition

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

+ References

No definition available.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-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 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-3

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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

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.W)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479583/944-40-S99-1

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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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