DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Cash Flow Hedging on Income Statement (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Derivative [Line Items] | ||
| Interest Income - Loans and Leases | $ 486,000,000 | $ 480,000,000 |
| Interest Expense - Short-Term Borrowings | 18,000,000 | 14,000,000 |
| Interest rate contracts | ||
| Derivative [Line Items] | ||
| Amount of gain (loss) reclassified from AOCI into net income | 0 | 0 |
| Interest rate contracts | Interest Income - Loans and Leases | ||
| Derivative [Line Items] | ||
| Amount of gain (loss) reclassified from AOCI into net income | 1,000,000 | (8,000,000) |
| Interest rate contracts | Interest Expense - Short-Term Borrowings | ||
| Derivative [Line Items] | ||
| Amount of gain (loss) reclassified from AOCI into net income | $ 0 | $ 0 |