FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 28,297,000,000	$ 27,740,000,000
Transfer in and/or (out) of Level 3	0
Other invested assets	1,033,000,000	941,000,000
Investments | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	258,000,000	274,000,000
Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 2,000,000,000	$ 2,000,000,000