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CREDIT FACILITIES - Schedule of Outstanding Letters of Credit and Borrowings (Details) | Oct. 20, 2025 GBP (£) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 GBP (£) | Sep. 30, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 30, 2024 EUR (€) | Oct. 30, 2024 GBP (£) | Jun. 10, 2024 USD ($) | Dec. 27, 2023 USD ($) | Aug. 18, 2023 USD ($) | Dec. 30, 2022 USD ($) | Nov. 21, 2022 USD ($) | Nov. 03, 2021 USD ($) | Aug. 27, 2021 USD ($) | Aug. 09, 2021 USD ($)
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds at Lloyds Syndicated Letter of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment | £ |  |  | £ 113,000,000 |  |  | £ 113,000,000 |  |  | £ 113,000,000 |  |  |  |  |  |  |  |
In Use | £ |  |  | £ 107,000,000 |  |  | £ 107,000,000 |  |  |  |  |  |  |  |  |  |  |
Funds at Lloyds Syndicated Letter of Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment | £ | £ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment | € |  |  |  | € 75,000,000 |  |  | € 75,000,000 | € 75,000,000 |  |  |  |  |  |  |  |  |
In Use | € |  |  |  | 48,000,000 |  |  | € 20,000,000 |  |  |  |  |  |  |  |  |  |
Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use | € |  |  |  | € 21,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Bermuda Re Wells Fargo Bank Bilateral LOC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 350,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 323,000,000 |  |  | 455,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - secured tranche |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 175,000,000 |  |  | 500,000,000 |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
In Use |  | 158,000,000 |  |  | 455,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - unsecured tranche |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 164,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Bermuda Re Citibank LOC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 370,000,000 |  |  | 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 295,000,000 |  |  | 293,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 230,000,000 |  |  | 230,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 230,000,000
In Use |  | 198,000,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 2,000,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility Five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 1,000,000 |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility Six |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 1,000,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility Seven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 3,000,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility Eight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 1,000,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank Letter of Credit Facility Nine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 0 |  |  | 197,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank Letter of Credit Facility Ten |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 0 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank Letter of Credit Facility Eleven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility - Uncommitted Facility One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 140,000,000 |  |  | 140,000,000 |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 75,000,000 |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility - Uncommitted Facility Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 8,000,000 |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Citibank LOC Facility - Uncommitted Facility Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility - Committed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 200,000,000 |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
In Use |  | 185,000,000 |  |  | 193,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Bayerische Landesbank Bilateral Unsecured Credit Facility - 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 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Lloyd's Bank Credit Facility - Committed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 250,000,000 |  |  | 250,000,000 |  |  |  |  |  | $ 15,000,000 | $ 250,000,000 |  |  |  |  |
In Use |  | 196,000,000 |  |  | 244,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 7,000,000 |  |  | 164,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Barclays Credit Facility One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment |  | 200,000,000 |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
In Use |  | 7,000,000 |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bermuda Re Barclays Credit Facility Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Use |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 + Details
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