INVESTMENTS - Trading Securities (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 | $ (69) | $ 49 | $ (56) | $ 82 |
| Net investment gains (losses) recognized on securities sold during the period | 0 | 1 | 2 | 7 |
| Unrealized and realized gains (losses) on trading securities | (69) | 50 | (54) | 89 |
| Interest and dividend income from trading securities | 21 | 18 | 63 | 52 |
| Net investment income (loss) from trading securities | $ (48) | $ 68 | $ 9 | $ 141 |