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Credit Facilities (Narrative) (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 26, 2016 | Jun. 22, 2012 | Dec. 31, 2022 | Dec. 31, 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 |  |  |
Borrowings from FHLB |  |  | $ 519,000,000 | $ 519,000,000 |  |
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 | $ 800,000,000 |  | $ 39,000,000 |  |
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 29, 2023 | Dec. 30, 2022 |  |
Line of credit facility, commitment |  |  | $ 500,000,000 | $ 500,000,000 | $ 500,000,000 | $ 50,000,000
Bermuda Re Citibank LOC Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, commitment |  |  | 370,000,000 | $ 370,000,000 |  |
Uncommitted amount available |  |  | $ 140,000,000 |  |  |
Bermuda Re Citibank Letter of Credit Facility One [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Jan. 21, 2023 | Feb. 28, 2022 |  |
Line of credit facility, commitment |  |  | $ 230,000,000 | $ 230,000,000 |  |
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2023 | Dec. 31, 2022 |  |
Line of credit facility, commitment |  |  | $ 200,000,000 | $ 200,000,000 |  |
Bermuda Re Bayerische Landesbank Unsecured Bilateral Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2023 |  |  |
Line of credit facility, commitment |  |  | $ 150,000,000 |  |  |
Bermuda Re Lloyd's Bank Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, commitment |  |  | $ 250,000,000 | $ 50,000,000 |  |
Bermuda Re Lloyd's Bank Credit Facility - Committed [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2023 | Dec. 31, 2022 |  |
Line of credit facility, commitment |  |  | $ 50,000,000 | $ 50,000,000 |  |
Bermuda Re Barclays Bilateral Letter of Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2023 | Dec. 31, 2022 |  |
Line of credit facility, commitment |  |  | $ 200,000,000 | $ 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% |  |  |
Admitted assets for FHLB |  |  | $ 22,400,000,000 |  |  |
Maximum amount available under FHLB |  |  | 2,200,000,000 |  |  |
Borrowings from FHLB |  |  | $ 519,000,000 |  |  |
Amount of borrowed funds required to be used to acquire additional membership stock, percentage |  |  | 4.50% |  |  |
Interest expense incurred |  |  | $ 4,000,000 | $ 1,000,000 |  |
Bermuda Re Nordea Bank Letter of Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, commitment |  |  | $ 300,000,000 |  |  |

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