DERIVATIVE FINANCIAL INSTRUMENTS - Financial Assets and Liabilities that are Offset (Details) $ in Millions |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2026
USD ($)
group
|
Dec. 31, 2025
USD ($)
|
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Number of primary groups | group | 2 | |
| Aggregate credit risk, net of collateral | $ 60 | $ 73 |
| Investment securities and cash collateral pledged by Huntington | 467 | |
| Investment securities and cash collateral pledged to Huntington | $ 237 |