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CREDIT FACILITIES - Schedule of Outstanding Letters of Credit and Borrowings (Details)	Oct. 20, 2025 GBP (£)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 GBP (£)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)	Dec. 30, 2024 EUR (€)	Oct. 30, 2024 GBP (£)	Jun. 10, 2024 USD ($)	Dec. 27, 2023 USD ($)	Aug. 18, 2023 USD ($)	Dec. 30, 2022 USD ($)	Nov. 21, 2022 USD ($)	Nov. 03, 2021 USD ($)	Aug. 27, 2021 USD ($)	Aug. 09, 2021 USD ($)
Line of Credit Facility [Line Items]
Commitment		$ 1,600,000,000
Funds at Lloyds Syndicated Letter of Credit Facility
Line of Credit Facility [Line Items]
Commitment | £			£ 113,000,000			£ 113,000,000			£ 113,000,000
In Use | £			£ 107,000,000			£ 107,000,000
Funds at Lloyds Syndicated Letter of Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Commitment | £	£ 150,000,000
Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility One
Line of Credit Facility [Line Items]
Commitment | €				€ 75,000,000			€ 75,000,000	€ 75,000,000
In Use | €				48,000,000			€ 20,000,000
Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Two
Line of Credit Facility [Line Items]
In Use | €				€ 21,000,000
Total Bermuda Re Wells Fargo Bank Bilateral LOC Facility
Line of Credit Facility [Line Items]
Commitment		350,000,000			$ 500,000,000
In Use		323,000,000			455,000,000
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - secured tranche
Line of Credit Facility [Line Items]
Commitment		175,000,000			500,000,000					$ 500,000,000
In Use		158,000,000			455,000,000
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - unsecured tranche
Line of Credit Facility [Line Items]
Commitment		175,000,000
In Use		164,000,000
Total Bermuda Re Citibank LOC Facility
Line of Credit Facility [Line Items]
Commitment		370,000,000			370,000,000
In Use		295,000,000			293,000,000
Bermuda Re Citibank LOC Facility One
Line of Credit Facility [Line Items]
Commitment		230,000,000			230,000,000												$ 230,000,000
In Use		198,000,000			0
Bermuda Re Citibank LOC Facility Two
Line of Credit Facility [Line Items]
In Use		0			4,000,000
Bermuda Re Citibank LOC Facility Three
Line of Credit Facility [Line Items]
In Use		4,000,000			2,000,000
Bermuda Re Citibank LOC Facility Four
Line of Credit Facility [Line Items]
In Use		2,000,000			1,000,000
Bermuda Re Citibank LOC Facility Five
Line of Credit Facility [Line Items]
In Use		1,000,000			3,000,000
Bermuda Re Citibank LOC Facility Six
Line of Credit Facility [Line Items]
In Use		1,000,000			1,000,000
Bermuda Re Citibank LOC Facility Seven
Line of Credit Facility [Line Items]
In Use		3,000,000			0
Bermuda Re Citibank LOC Facility Eight
Line of Credit Facility [Line Items]
In Use		1,000,000			0
Bermuda Re Citibank Letter of Credit Facility Nine
Line of Credit Facility [Line Items]
In Use		0			197,000,000
Bermuda Re Citibank Letter of Credit Facility Ten
Line of Credit Facility [Line Items]
In Use		0			1,000,000
Bermuda Re Citibank Letter of Credit Facility Eleven
Line of Credit Facility [Line Items]
In Use		2,000,000
Bermuda Re Citibank LOC Facility - Uncommitted Facility One
Line of Credit Facility [Line Items]
Commitment		140,000,000			140,000,000
In Use		75,000,000			75,000,000
Bermuda Re Citibank LOC Facility - Uncommitted Facility Two
Line of Credit Facility [Line Items]
In Use		8,000,000			7,000,000
Bermuda Re Citibank LOC Facility - Uncommitted Facility Three
Line of Credit Facility [Line Items]
In Use
Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility - Committed
Line of Credit Facility [Line Items]
Commitment		200,000,000			200,000,000											$ 200,000,000
In Use		185,000,000			193,000,000
Bermuda Re Bayerische Landesbank Bilateral Unsecured Credit Facility - Committed
Line of Credit Facility [Line Items]
Commitment		150,000,000			150,000,000								$ 150,000,000
In Use		150,000,000			150,000,000
Bermuda Re Lloyd's Bank Credit Facility - Committed
Line of Credit Facility [Line Items]
Commitment		250,000,000			250,000,000						$ 15,000,000	$ 250,000,000
In Use		196,000,000			244,000,000
Bermuda Re Barclays Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Commitment		200,000,000			200,000,000										$ 200,000,000
In Use		7,000,000			164,000,000
Bermuda Re Barclays Credit Facility One
Line of Credit Facility [Line Items]
Commitment		200,000,000			200,000,000
In Use		7,000,000			150,000,000
Bermuda Re Barclays Credit Facility Two
Line of Credit Facility [Line Items]
In Use					14,000,000
Total Nordea Bank ABP, NY LOC Facility
Line of Credit Facility [Line Items]
Commitment		300,000,000			300,000,000									$ 300,000,000
In Use		300,000,000			300,000,000
Nordea Bank Letter of Credit Facility - Committed
Line of Credit Facility [Line Items]
Commitment		200,000,000			200,000,000									200,000,000
In Use		200,000,000			200,000,000
Nordea Bank Letter of Credit Facility - Uncommitted
Line of Credit Facility [Line Items]
Commitment		100,000,000			100,000,000									$ 100,000,000
In Use		$ 100,000,000			$ 100,000,000

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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