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CREDIT FACILITIES - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 27, 2023	Dec. 13, 2023	Aug. 18, 2023	Dec. 30, 2022	Nov. 21, 2022	Nov. 03, 2021	Aug. 27, 2021	Aug. 09, 2021	May 05, 2021	Feb. 23, 2021
Line of Credit Facility [Line Items]
Line of credit facility, commitment	$ 1,700,000,000
Uncommitted amount available	240,000,000
Extension period for availability					2 years
Borrowings from FHLB	$ 819,000,000		$ 819,000,000
Federal Home Loan Bank of New York | Everest Reinsurance Company (Everest Re)
Line of Credit Facility [Line Items]
Maximum percentage of admitted assets allowed for borrowing base	10.00%
Admitted assets for FHLB	$ 27,100,000,000
Maximum amount available under FHLB	2,700,000,000
Borrowings from FHLB	819,000,000
Interest expense incurred	$ 11,000,000	$ 6,000,000
Amount of borrowed funds required to be used to acquire additional membership stock, percentage	4.50%
Federal Home Loan Bank of New York | Everest Reinsurance Company (Everest Re) | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Qualifying collateral pledged	$ 1,100,000,000
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	500,000,000		500,000,000									$ 500,000,000	$ 50,000,000
Bermuda Re Citibank LOC Facility - Uncommitted
Line of Credit Facility [Line Items]
Uncommitted amount available											$ 140,000,000
Bermuda Re Citibank LOC Facility One
Line of Credit Facility [Line Items]
Line of credit facility, commitment	230,000,000		230,000,000								$ 230,000,000
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000							$ 200,000,000
Bayerische Landesbank Bilateral Unsecured LOC Agreement - Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	150,000,000		150,000,000				$ 150,000,000
Bermuda Re Lloyd's Bank Credit Facility-Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	250,000,000		250,000,000	$ 15,000,000		$ 250,000,000
Bermuda Re Barclays Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000						$ 200,000,000
Total Nordea Bank ABP, NY LOC Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	300,000,000		300,000,000					$ 300,000,000
Nordea Bank Letter of Credit Facility - Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000					200,000,000
Nordea Bank Letter of Credit Facility - Uncommitted
Line of Credit Facility [Line Items]
Line of credit facility, commitment	$ 100,000,000		$ 100,000,000					$ 100,000,000

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