DERIVATIVES - Schedule of Fair Value Hedges (Details) - Interest rate swap - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest expense - long-term borrowed funds
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	$ (19)	$ (13)	$ (71)	$ (51)
Hedged item	19	13	70	50
Interest and fees on loans and leases
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	18	0	15	0
Hedged item	(19)	0	(15)	0
Interest income - investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	0	7	29	39
Hedged item	$ 0	$ (7)	$ (29)	$ (39)