INVESTMENTS - Trading 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 | $ (31) | $ (17) |
| Net investment gains (losses) recognized on securities sold during the period | 0 | 16 |
| Unrealized and realized gains (losses) on trading securities | (31) | (1) |
| Interest and dividend income from trading securities | 19 | 9 |
| Net investment income (loss) from trading securities | $ (12) | $ 8 |