INVESTMENTS - Fixed Maturities (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Net investment gains (losses) recognized during the period on securities held at the end of the period | $ (4) | $ 3 | $ 1 | $ 15 |
| Net investment gains (losses) recognized on securities sold during the period | 0 | 1 | (15) | 2 |
| Unrealized and realized gains (losses) from fixed maturities | (4) | 4 | (14) | 17 |
| Interest and dividend income from fixed maturities | 18 | 8 | 36 | 4 |
| Net investment income (loss) from fixed maturities | $ 14 | $ 12 | $ 22 | $ 21 |