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FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
FAIR VALUE - Narrative (Details) - USD ($)	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 34,445,000,000		$ 34,445,000,000		$ 34,573,000,000
Transfer in and/or (out) of Level 3	0	$ 0	0	$ 0
Other invested assets	1,682,000,000		1,682,000,000		1,372,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at fair value and Short-term investments	141,000,000		141,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Debt Securities \| Everest Canada
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at fair value and Short-term investments	117,000,000		117,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Short-term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at fair value and Short-term investments	41,000,000		41,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Short-term investments \| Everest Canada
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at fair value and Short-term investments	41,000,000		41,000,000
Investments \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	206,000,000		206,000,000		233,000,000
Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 2,800,000,000		$ 2,800,000,000		$ 2,500,000,000