SECURITIES FINANCING ACTIVITIES - Schedule of Gross Amounts of Liabilities Associated with Securities Financing Activities by Class of Underlying Collateral (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | $ 46,440 | $ 39,855 |
| Securities lending | 11 | 1 |
| Gross amounts of recognized liabilities | 46,451 | 39,856 |
| U.S. Treasury | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | 25,280 | 20,707 |
| Securities lending | 0 | 0 |
| Gross amounts of recognized liabilities | 25,280 | 20,707 |
| Agency MBS | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | 19,559 | 17,671 |
| Securities lending | 0 | 0 |
| Gross amounts of recognized liabilities | 19,559 | 17,671 |
| Corporate and other securities | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | 1,601 | 1,477 |
| Securities lending | 11 | 1 |
| Gross amounts of recognized liabilities | $ 1,612 | $ 1,478 |