INVESTMENTS - Equity Securities (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||
| Net investment gains (losses) recognized during the period on securities held at the end of the period | $ (6) | $ 0 |
| Net investment gains (losses) recognized on securities sold during the period | 1 | 0 |
| Unrealized and realized gains (losses) on equity securities | $ (5) | $ 0 |