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CREDIT FACILITIES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 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		$ 1,500,000,000
Uncommitted amount available	$ 440,000,000		$ 440,000,000
Maximum percentage of admitted assets allowed for borrowing base	10.00%		10.00%
Borrowings from FHLB	$ 519,000,000		$ 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					$ 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		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				$ 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			$ 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			$ 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		$ 200,000,000
Federal Home Loan Bank of New York
Line of Credit Facility [Line Items]
Admitted assets for FHLB	24,000,000,000		24,000,000,000
Maximum amount available under FHLB	2,000,000,000		2,000,000,000
Borrowings from FHLB	519,000,000		519,000,000
Interest expense incurred	$ 7,000,000	$ 800,000	$ 13,000,000	$ 2,000,000
Amount of borrowed funds required to be used to acquire additional membership stock, percentage	4.50%

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Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Admitted Assets

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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