FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 33,464,000,000	$ 33,464,000,000	$ 28,908,000,000
Transfer in and/or (out) of Level 3	0	0
Other invested assets	1,230,000,000	1,230,000,000	1,171,000,000
Investments \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	251,000,000	251,000,000	239,000,000
Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 2,300,000,000	$ 2,300,000,000	$ 2,200,000,000

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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