CREDIT FACILITIES - Narrative (Details)	3 Months Ended		9 Months Ended
CREDIT FACILITIES - Narrative (Details)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 GBP (£)	Sep. 30, 2025 EUR (€)	Aug. 18, 2025	Jun. 09, 2025	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)	Dec. 30, 2024 EUR (€)	Oct. 30, 2024 GBP (£)	Aug. 16, 2024	Jun. 10, 2024 USD ($)	Dec. 27, 2023 USD ($)	Dec. 13, 2023	Aug. 18, 2023 USD ($)	Dec. 30, 2022 USD ($)	Nov. 21, 2022 USD ($)	Nov. 03, 2021 USD ($)	Aug. 27, 2021 USD ($)	Aug. 09, 2021 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, commitment	$ 1,600,000,000		$ 1,600,000,000
Uncommitted amount available	240,000,000		240,000,000
Borrowings from FHLB	$ 1,019,000,000		$ 1,019,000,000						$ 1,019,000,000
Federal Home Loan Bank of New York \| Everest Reinsurance Company (Everest Re)
Line of Credit Facility [Line Items]
Maximum percentage of admitted assets allowed for borrowing base	10.00%		10.00%		10.00%	10.00%
Admitted assets for FHLB	$ 33,000,000,000.0		$ 33,000,000,000.0
Maximum amount available under FHLB	3,300,000,000		3,300,000,000
Borrowings from FHLB	1,000,000,000.0		1,000,000,000.0
Interest expense	12,000,000	$ 11,000,000	$ 37,000,000	$ 33,000,000
Amount of borrowed funds required to be used to acquire additional membership stock, percentage			4.50%
Qualifying collateral pledged	1,300,000,000		$ 1,300,000,000
Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	350,000,000		350,000,000						500,000,000
Extension period for availability								2 years
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - secured tranche
Line of Credit Facility [Line Items]
Line of credit facility, commitment	175,000,000		175,000,000						500,000,000						$ 500,000,000
Bermuda Re Wells Fargo Bank Bilateral LOC Facility - unsecured tranche
Line of Credit Facility [Line Items]
Line of credit facility, commitment	175,000,000		175,000,000
Bermuda Re Citibank LOC Facility - Uncommitted
Line of Credit Facility [Line Items]
Extension period for availability																	2 years
Line of credit facility, maximum uncommitted amount																							$ 140,000,000
Bermuda Re Citibank LOC Facility One
Line of Credit Facility [Line Items]
Line of credit facility, commitment	230,000,000		230,000,000						230,000,000														$ 230,000,000
Bermuda Re Bayerische Landesbank Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000						200,000,000													$ 200,000,000
Extension period for availability														3 years
Bermuda Re Bayerische Landesbank Bilateral Unsecured Credit Facility - Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	150,000,000		150,000,000						150,000,000										$ 150,000,000
Bermuda Re Lloyd's Bank Credit Facility - Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	250,000,000		250,000,000						250,000,000							$ 15,000,000		$ 250,000,000
Extension period for availability							2 years
Bermuda Re Barclays Bilateral Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000						200,000,000												$ 200,000,000
Extension period for availability													3 years
Total Nordea Bank ABP, NY LOC Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment	300,000,000		300,000,000						300,000,000											$ 300,000,000
Nordea Bank Letter of Credit Facility - Committed
Line of Credit Facility [Line Items]
Line of credit facility, commitment	200,000,000		200,000,000						200,000,000											200,000,000
Nordea Bank Letter of Credit Facility - Uncommitted
Line of Credit Facility [Line Items]
Line of credit facility, commitment	$ 100,000,000		$ 100,000,000						$ 100,000,000											$ 100,000,000
Funds at Lloyds Syndicated Letter of Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, commitment \| £					£ 113,000,000					£ 113,000,000			£ 113,000,000
Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility One
Line of Credit Facility [Line Items]
Line of credit facility, commitment \| €						€ 75,000,000					€ 75,000,000	€ 75,000,000

EVEREST GROUP, LTD. 10-Q