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CREDIT FACILITIES - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 30, 2022	Nov. 03, 2021	Oct. 08, 2021	Aug. 27, 2021	Aug. 09, 2021	May 05, 2021	Feb. 23, 2021
Line of Credit Facility [Line Items]
Line of credit facility, commitment	$ 1,500,000,000
Uncommitted amount available	$ 440,000,000
Maximum percentage of admitted assets allowed for borrowing base	10.00%
Borrowings from FHLB	$ 519,000,000		$ 519,000,000
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment									$ 500,000,000	$ 50,000,000
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 Citibank LOC Facility - Uncommitted
Line of Credit Facility [Line Items]
Line of credit facility, commitment	140,000,000		140,000,000
Uncommitted amount available								$ 140,000,000
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
Bermuda Re Bayerische Landesbank Unsecured Bilateral Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment				$ 150,000,000
Bermuda Re Lloyd's Bank Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	250,000,000		250,000,000			$ 250,000,000
Bermuda Re Lloyd's Bank Credit Facility One
Line of Credit Facility [Line Items]
Line of credit facility, commitment	50,000,000		50,000,000			$ 50,000,000
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
Federal Home Loan Bank of New York
Line of Credit Facility [Line Items]
Admitted assets for FHLB	23,100,000,000
Maximum amount available under FHLB	2,300,000,000
Borrowings from FHLB	519,000,000
Interest expense incurred	$ 6,000,000	$ 700,000
Amount of borrowed funds required to be used to acquire additional membership stock, percentage	4.50%

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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