COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Other Commitments [Line Items] | ||
| Commitment amount | $ 110,208 | $ 107,915 |
| Commitments to extend credit | ||
| Other Commitments [Line Items] | ||
| Commitment amount | 107,356 | 105,880 |
| Letters of credit | ||
| Other Commitments [Line Items] | ||
| Commitment amount | 2,741 | 1,902 |
| Loans sold with recourse | ||
| Other Commitments [Line Items] | ||
| Commitment amount | 81 | 85 |
| Risk participation agreements | ||
| Other Commitments [Line Items] | ||
| Commitment amount | 21 | 37 |
| Other commitments | ||
| Other Commitments [Line Items] | ||
| Commitment amount | $ 9 | $ 11 |