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CREDIT FACILITIES - Summary of Outstanding Letters of Credit and Borrowings (Details) - USD ($)	Sep. 30, 2023	Aug. 18, 2023	Dec. 31, 2022	Dec. 30, 2022	Nov. 03, 2021	Aug. 27, 2021	Aug. 09, 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	434,000,000		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	266,000,000		463,000,000
Wells Fargo Bank Bilateral LOC Agreement Two
Line of Credit Facility [Line Items]
In Use	121,000,000		0
Wells Fargo Bank Bilateral LOC Agreement Three
Line of Credit Facility [Line Items]
In Use	23,000,000		0
Wells Fargo Bank Bilateral LOC Agreement Four
Line of Credit Facility [Line Items]
In Use	24,000,000		0
Total Citibank Bilateral Agreement
Line of Credit Facility [Line Items]
Commitment	370,000,000		370,000,000
In Use	338,000,000		329,000,000
Bermuda Re Citibank LOC Facility One
Line of Credit Facility [Line Items]
Commitment	230,000,000		230,000,000				$ 230,000,000
In Use	209,000,000		1,000,000
Bermuda Re Citibank LOC Facility Two
Line of Credit Facility [Line Items]
In Use	0		4,000,000
Bermuda Re Citibank LOC Facility Three
Line of Credit Facility [Line Items]
In Use	4,000,000		1,000,000
Bermuda Re Citibank LOC Facility Four
Line of Credit Facility [Line Items]
In Use	1,000,000		1,000,000
Bermuda Re Citibank LOC Facility Five
Line of Credit Facility [Line Items]
In Use	3,000,000		3,000,000
Bermuda Re Citibank LOC Facility Six
Line of Credit Facility [Line Items]
In Use	1,000,000		212,000,000
Bermuda Re Citibank LOC Facility Seven
Line of Credit Facility [Line Items]
In Use	6,000,000		0
Bermuda Re Citibank LOC Facility Eight
Line of Credit Facility [Line Items]
In Use	1,000,000		0
Bermuda Re Citibank LOC Facility - Uncommitted
Line of Credit Facility [Line Items]
Commitment	140,000,000		140,000,000
In Use	105,000,000		87,000,000
Bermuda Re Citibank Letter of Credit Facility Nine
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	179,000,000		184,000,000
Bermuda Re Bayerische Landesbank Bilateral Unsecured Letter of Credit Facility
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 LOC Facility
Line of Credit Facility [Line Items]
Commitment	250,000,000	$ 250,000,000	250,000,000
In Use	206,000,000		186,000,000
Bermuda Re Lloyd's Bank LOC Facility One
Line of Credit Facility [Line Items]
Commitment	250,000,000		50,000,000
In Use	158,000,000		50,000,000
Bermuda Re Lloyd's Bank LOC Facility Two
Line of Credit Facility [Line Items]
In Use	48,000,000
Bermuda Re Lloyd's Bank LOC 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	$ 179,000,000		$ 179,000,000

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.

+ References

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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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- Definition

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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