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CREDIT FACILITIES - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Aug. 18, 2023	Dec. 31, 2022	Dec. 30, 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		$ 1,700,000,000
Uncommitted amount available	$ 240,000,000		$ 240,000,000
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		500,000,000			500,000,000					$ 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 Bilateral Unsecured Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	150,000,000		150,000,000			150,000,000	$ 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 LOC Facility One
Line of Credit Facility [Line Items]
Line of credit facility, commitment	250,000,000		250,000,000			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	25,000,000,000		25,000,000,000
Maximum amount available under FHLB	2,500,000,000		2,500,000,000
Borrowings from FHLB	519,000,000		519,000,000
Interest expense incurred	$ 7,000,000	$ 800,000	$ 21,000,000	$ 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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