INVESTMENTS - Equity Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 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 | $ 0 | $ (2) | $ (6) | $ (2) |
| Net investment gains (losses) recognized on securities sold during the period | 3 | 2 | 4 | 2 |
| Unrealized and realized gains (losses) on equity securities | $ 3 | $ 0 | $ (2) | $ 0 |