FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 29,031,000,000	$ 29,031,000,000	$ 27,740,000,000
Transfer in and/or (out) of Level 3	0	0
Other invested assets	983,000,000	983,000,000	941,000,000
Investments \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	260,000,000	260,000,000	274,000,000
Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 2,000,000,000.0	$ 2,000,000,000.0	$ 2,000,000,000.0

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).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of assets classified as other.

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