DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Cash Flow Hedging on Income Statement (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Interest Income - Loans and Leases	$ 242,000,000	$ 224,000,000	$ 463,000,000	$ 445,000,000
Interest Expense - Short-Term Borrowings	$ 5,000,000	$ 7,000,000	11,000,000	14,000,000
Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			0	0
Interest Income - Loans and Leases | Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			3,000,000	1,000,000
Interest Expense - Short-Term Borrowings | Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			$ (7,000,000)	$ (10,000,000)