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Credit Facilities (Narrative) (Details) £ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 26, 2016 USD ($) | Jun. 22, 2012 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($) | May 05, 2021 USD ($) | Feb. 23, 2021 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | $ 1,200,000,000 |  |  |  |
Uncommitted amount available |  |  |  |  |  | 340,000,000.0 |  |  |  |
Borrowings from FHLB |  |  |  |  |  | 519,000,000 |  |  |  | $ 310,000,000
Wells Fargo Bank Group Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, term of credit facility | 5 years | 4 years |  |  |  |  |  |  |  |
Line of credit facility, commitment | $ 800,000,000.0 | $ 800,000,000.0 |  |  |  | 39,198,000 |  |  |  | 800,000,000
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 30, 2022 |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 500,000,000 | $ 500,000,000.0 | $ 50,000,000.0 |  |
Bermuda Re Citibank LOC Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 370,000,000 |  |  |  | 200,000,000
Uncommitted amount available |  |  |  |  |  | 140,000,000.0 |  |  |  |
Bermuda Re Citibank Letter of Credit Facility One [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Feb. 28, 2022 | Feb. 28, 2021 |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 230,000,000 |  |  |  | $ 200,000,000
Everest International Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  | Dec. 31, 2024 |  |  |  |  |  |
Line of credit facility, commitment | £ |  |  |  |  |  |  |  |  | £ 52,175 |
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2022 |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 200,000,000.0 |  |  |  |
Bermuda Re Lloyd's Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2022 |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 50,000,000 |  |  |  |
Uncommitted amount available |  |  |  |  |  | 250,000,000.0 |  |  |  |
Bermuda Re Barclays Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2022 |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | $ 200,000,000 |  |  |  |
Federal Home Loan Bank Of New York [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum percentage of admitted assets allowed for borrowing base |  |  |  |  | 10.00% | 10.00% |  |  |  |
Admitted assets for FHLB |  |  |  |  |  | $ 20,300,000,000 |  |  |  |
Maximum amount available under FHLB |  |  |  |  |  | 2,000,000,000.0 |  |  |  |
Borrowings from FHLB |  |  |  |  |  | $ 519,000,000.0 |  |  |  |
Amount of borrowed funds required to be used to acquire additional membership stock, percentage |  |  | 4.50% |  |  |  |  |  |  |
Interest expense incurred |  |  | $ 1,200,000 | $ 200,000 |  |  |  |  |  |
Federal Home Loan Bank Of New York [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
FHLB advance interest rate |  |  |  |  | 0.53% | 0.53% |  |  |  |
FHLB advance maturity |  |  | Nov. 30, 2021 |  |  |  |  |  |  |
Federal Home Loan Bank Of New York [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
FHLB advance interest rate |  |  |  |  | 0.65% | 0.65% |  |  |  |
FHLB advance maturity |  |  | Dec. 31, 2021 |  |  |  |  |  |  |

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