LEASES - Schedule of Operating Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Lease income – operating leases	$ 1,037	$ 966	$ 895
Variable lease income – operating leases	59	82	76
Rental income on operating leases	1,096	1,048	971
Interest income – sales type and direct financing leases	175	175	171
Variable lease income included in other noninterest income	58	61	59
Interest income – leveraged leases	3	4	12
Total lease income	$ 1,332	$ 1,288	$ 1,213