LEASES - Schedule of Operating Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Lease income – Operating leases	$ 236	$ 229	$ 714	$ 664
Variable lease income – Operating leases	26	19	62	55
Rental income on operating leases	262	248	776	719
Interest income – Sales type and direct financing leases	44	43	131	127
Variable lease income included in Other noninterest income	15	15	46	44
Interest income – Leveraged leases	1	2	3	11
Total lease income	$ 322	$ 308	$ 956	$ 901