DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Cash Flow Hedging on Income Statement (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Interest Income - Loans and Leases	$ 297,000,000	$ 226,000,000	$ 760,000,000	$ 671,000,000
Interest Expense - Short-Term Borrowings	$ 6,000,000	$ 7,000,000	17,000,000	21,000,000
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)	1,000,000
Interest rate contracts | Interest Expense - Short-Term Borrowings
Derivative [Line Items]
Amount of gain (loss) reclassified from AOCI into net income			$ (7,000,000)	$ (15,000,000)