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Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2022
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Years Ended December 31, (Dollars in millions) 2022 2021 2020 Credit facility interest and fees incurred - Wells Fargo Bank $ - $ - $ 1
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility $ - $ - $ 39 $ 39 12/30/2022
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry  Commitment In Use Date of Expiry Wells Fargo Bank Bilateral LOC Agreement $ 500 $ 463 12/29/2023 $ 500 $ 351 12/30/2022 (Some amounts may not reconcile due to rounding.)
Bermuda Re Citibank LOC Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Bermuda Re Citibank LOC Facility- Committed $ 230 $ 1 1/21/2023 $ 230 $ 4 02/28/2022 4 2/28/2023 1 03/01/2022 1 3/1/2023 1 11/24/2022 1 8/15/2023 217 12/31/2022 3 9/23/2023 1 8/15/2023 212 12/31/2023 1 9/23/2023 Bermuda Re Citibank LOC Facility - Uncommitted 140 87 12/31/2023 140 84 12/31/2022 18 12/30/2026 23 12/30/2025 Total Citibank Bilateral Agreement $ 370 $ 329 $ 370 $ 333 (Some amounts may not reconcile due to rounding.)
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry  Commitment In Use Date of Expiry Bayerische Landesbank Bilateral Secured Credit Facility $ 200 $ 183 12/31/2023 $ 200 $ 155 12/31/2022 (Some amounts may not reconcile due to rounding.)
Bermuda Re Bayerische Landesbank Unsecured Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 Bank Commitment In Use Date of Expiry Bayerische Landesbank Unsecured Bilateral LOC Agreement - Committed $ 150 $ 150 12/31/2023 (Some amounts may not reconcile due to rounding.)
Bermuda Re Lloyd's Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Bermuda Re Lloyd's Bank Credit Facility-Committed $ 50 $ 50 12/31/2023 $ 50 $ 46 12/31/2022 Bermuda Re Lloyd's Bank Credit Facility-Uncommitted 200 136 12/31/2023 - - Total Bermuda Re Lloyd's Bank Credit Facility $ 250 $ 186 $ 50 $ 46 (Some amounts may not reconcile due to rounding.)
Bermuda Re Barclays Bilateral Letter of Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 At December 31, 2021 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Bermuda Re Barclays Credit Facility $ 200 $ 179 12/31/2023 $ 200 $ 186 12/31/2022 (Some amounts may not reconcile due to rounding.)
Bermuda Re Nordea Bank Letter of Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in millions) At December 31, 2022 Bank Commitment In Use Date of Expiry Nordea Bank ABP, NY Unsecured LOC Facility - Committed $ 200 $ 50 12/31/2023 Nordea Bank ABP, NY Unsecured LOC Facility - Uncommitted 100 100 12/31/2023 Total Nordea Bank ABP, NY LOC Facility $ 300 $ 150 (Some amounts may not reconcile due to rounding.)

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Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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