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CREDIT FACILITIES - Narrative (Details) - USD ($) | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Oct. 30, 2024 | Aug. 16, 2024 | Jun. 10, 2024 | Dec. 27, 2023 | Dec. 13, 2023 | Aug. 18, 2023 | Dec. 30, 2022 | Nov. 21, 2022 | Nov. 03, 2021 | Aug. 27, 2021 | Aug. 09, 2021 | May 05, 2021
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | $ 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncommitted amount available | 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from FHLB | $ 1,019,000,000 |  | $ 1,019,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank of New York | Everest Reinsurance Company (Everest Re) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of admitted assets allowed for borrowing base | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Admitted assets for FHLB | $ 31,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount available under FHLB | 3,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from FHLB | 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 12,000,000 | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of borrowed funds required to be used to acquire additional membership stock, percentage | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Qualifying collateral pledged | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Extension period for availability |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility - Uncommitted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum uncommitted amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000,000 |
Extension period for availability |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
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 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 |  |
Extension period for availability |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Bermuda Re Bayerische Landesbank Bilateral Unsecured Credit Facility - Committed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 Credit Facility-Committed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment | 250,000,000 |  | 250,000,000 |  |  |  | $ 15,000,000 |  | $ 250,000,000 |  |  |  |  |  |
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 |  |  |
Extension period for availability |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Total Nordea Bank ABP, NY LOC 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 |  |  |  |

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