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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value Inputs Assets Quantitative Information [Line Items] |  |  |
Change in purchased market risk benefit asset fair value | $ 49 |  | $ 382
AFS fixed maturities transferred from Level 3 to Level 2 | 614 | $ 168 |
AFS fixed maturities transferred from Level 2 to Level 3 | $ 63 | $ 128 |
Percentage of total equity representing AFS fixed maturities transferred | 42.20% | 6.00% |
Nonrecurring | Level 3 |  |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |  |
Investments, fair value | $ 2,900 |  | $ 1,700

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