LEASES - Schedule of Operating Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Lease income – Operating leases	$ 241	$ 221	$ 478	$ 435
Variable lease income – Operating leases	18	17	36	36
Rental income on operating leases	259	238	514	471
Interest income – Sales type and direct financing leases	44	43	87	84
Variable lease income included in Other noninterest income	15	14	31	28
Interest income – Leveraged leases	1	4	2	9
Total lease income	$ 319	$ 299	$ 634	$ 592