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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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