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CREDIT FACILITIES - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 27, 2023 | Dec. 13, 2023 | Aug. 18, 2023 | Dec. 30, 2022 | Nov. 21, 2022 | Nov. 03, 2021 | Aug. 27, 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 | $ 519,000,000 |  |  |  |  |  |  |  |  |
Federal Home Loan Bank Membership |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of admitted assets allowed for borrowing base | 10.00% |  |  |  |  |  |  |  |  |  |
Admitted assets for FHLB | $ 26,300,000,000 |  |  |  |  |  |  |  |  |  |
Maximum amount available under FHLB | 2,600,000,000 |  |  |  |  |  |  |  |  |  |
Interest expense | $ 30,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |
Amount of borrowed funds required to be used to acquire additional membership stock, percentage | 4.50% |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank Membership | Asset Pledged as Collateral |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Qualifying collateral pledged | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
Bermuda Re Wells Fargo 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 Letter of Credit Facility - Uncommitted |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Uncommitted amount available | 140,000,000 |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank Letter of Credit Facility One |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | 230,000,000 | 230,000,000 |  |  |  |  |  |  |  |  |
Bermuda Re Bayerische Landesbank Bilateral Secured 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 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 |  |  |  |  |
Bermuda Re Lloyd’s Bank Letter of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |
Bermuda Re Lloyd's Bank Credit Facility-Committed |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | 250,000,000 | 50,000,000 | $ 15,000,000 |  | $ 250,000,000 |  |  |  |  |  |
Bermuda Re Barclays Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | 200,000,000 | 200,000,000 |  |  |  |  |  | $ 200,000,000 |  |  |
Bermuda Re Nordea Bank Letter of Credit 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 |  |  |  |

X
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