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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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