LEASES - Schedule of Operating Lease Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Lease income – Operating leases	$ 237	$ 214
Variable lease income – Operating leases	18	19
Rental income on operating leases	255	233
Interest income – Sales type and direct financing leases	43	41
Variable lease income included in Other noninterest income	16	15
Interest income – Leveraged leases	1	5
Total lease income	$ 315	$ 294