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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value Inputs Assets Quantitative Information [Line Items]
Change in purchased market risk benefit asset fair value	$ 558		$ 687
AFS fixed maturities transferred from Level 3 to Level 2	169	$ 401
AFS fixed maturities transferred from Level 2 to Level 3	$ 120	$ 56
Percentage of total equity representing AFS fixed maturities transferred	7.70%	8.40%
Nonrecurring | Level 3
Fair Value Inputs Assets Quantitative Information [Line Items]
Investments, fair value	$ 1,200		$ 1,100

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Percentage of transfers into assets measured at fair value that have taken place during the period.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of increase (decrease) in contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk from change in assumption, classified as other.

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