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CREDIT FACILITIES - Schedule of Outstanding Letters of Credit and Borrowings (Details) - USD ($)	Dec. 31, 2023	Dec. 27, 2023	Aug. 18, 2023	Dec. 31, 2022	Dec. 30, 2022	Nov. 21, 2022	Nov. 03, 2021	Aug. 27, 2021	May 05, 2021	Feb. 23, 2021
Line of Credit Facility [Line Items]
Commitment	$ 1,700,000,000
Wells Fargo Bank Bilateral LOC Agreement
Line of Credit Facility [Line Items]
Commitment	500,000,000			$ 500,000,000					$ 500,000,000	$ 50,000,000
In Use	486,000,000			463,000,000
Wells Fargo Bank Bilateral LOC Agreement One
Line of Credit Facility [Line Items]
Commitment	500,000,000			500,000,000
In Use	97,000,000			463,000,000
Wells Fargo Bank Bilateral LOC Agreement Two
Line of Credit Facility [Line Items]
In Use	71,000,000			0
Wells Fargo Bank Bilateral LOC Agreement Three
Line of Credit Facility [Line Items]
In Use	318,000,000			0
Total Citibank Bilateral Agreement
Line of Credit Facility [Line Items]
Commitment	370,000,000			370,000,000
In Use	340,000,000			329,000,000
Bermuda Re Citibank LOC Facility- Committed One
Line of Credit Facility [Line Items]
Commitment	230,000,000			230,000,000
In Use	0			1,000,000
Bermuda Re Citibank LOC Facility- Committed Two
Line of Credit Facility [Line Items]
In Use	4,000,000			4,000,000
Bermuda Re Citibank LOC Facility- Committed Three
Line of Credit Facility [Line Items]
In Use	1,000,000			1,000,000
Bermuda Re Citibank LOC Facility- Committed Four
Line of Credit Facility [Line Items]
In Use	3,000,000			1,000,000
Bermuda Re Citibank LOC Facility- Committed Five
Line of Credit Facility [Line Items]
In Use	1,000,000			3,000,000
Bermuda Re Citibank LOC Facility- Committed Six
Line of Credit Facility [Line Items]
In Use	0			0
Bermuda Re Citibank LOC Facility- Committed Seven
Line of Credit Facility [Line Items]
In Use	0			0
Bermuda Re Citibank LOC Facility- Committed Eight
Line of Credit Facility [Line Items]
In Use	217,000,000			212,000,000
Bermuda Re Citibank Letter of Credit Facility Nine
Line of Credit Facility [Line Items]
In Use	1,000,000			0
Bermuda Re Citibank LOC Facility - Uncommitted Facility One
Line of Credit Facility [Line Items]
Commitment	140,000,000			140,000,000
In Use	105,000,000			87,000,000
Bermuda Re Citibank LOC Facility - Uncommitted Facility Two
Line of Credit Facility [Line Items]
In Use	7,000,000			18,000,000
Bayerische Landesbank Bilateral Secured Credit Facility
Line of Credit Facility [Line Items]
Commitment	200,000,000			200,000,000				$ 200,000,000
In Use	192,000,000			183,000,000
Bayerische Landesbank Bilateral Unsecured LOC Agreement - Committed
Line of Credit Facility [Line Items]
Commitment	150,000,000			150,000,000	$ 150,000,000
In Use	150,000,000			150,000,000
Total Bermuda Re Lloyd's Bank Credit Facility
Line of Credit Facility [Line Items]
Commitment	250,000,000			250,000,000
In Use	235,000,000			186,000,000
Bermuda Re Lloyd's Bank Credit Facility-Committed
Line of Credit Facility [Line Items]
Commitment	250,000,000	$ 15,000,000	$ 250,000,000	50,000,000
In Use	235,000,000			50,000,000
Bermuda Re Lloyd's Bank Credit Facility-Uncommitted
Line of Credit Facility [Line Items]
Commitment	0			200,000,000
In Use	0			136,000,000
Bermuda Re Barclays Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Commitment	200,000,000			200,000,000			$ 200,000,000
In Use	182,000,000			179,000,000
Bermuda Re Barclays Bilateral Letter of Credit Facility One
Line of Credit Facility [Line Items]
Commitment	200,000,000			200,000,000
In Use	168,000,000			179,000,000
Bermuda Re Barclays Bilateral Letter of Credit Facility Two
Line of Credit Facility [Line Items]
Commitment	0			0
In Use	14,000,000			0
Total Nordea Bank ABP, NY LOC Facility
Line of Credit Facility [Line Items]
Commitment	300,000,000			300,000,000		$ 300,000,000
In Use	300,000,000			150,000,000
Nordea Bank Letter of Credit Facility - Committed
Line of Credit Facility [Line Items]
Commitment	200,000,000			200,000,000		200,000,000
In Use	200,000,000			50,000,000
Nordea Bank Letter of Credit Facility - Uncommitted
Line of Credit Facility [Line Items]
Commitment	100,000,000			100,000,000		$ 100,000,000
In Use	$ 100,000,000			$ 100,000,000

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a 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. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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