PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total	$ 4,350	$ 3,634
Less accumulated depreciation and amortization	1,903	1,628
Premises and equipment, net	2,447	2,006
Land
Property, Plant and Equipment [Line Items]
Total	496	407
Premises and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	$ 1,808	1,598
Premises and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (years)	3 years
Premises and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (years)	30 years
Furniture, equipment and software
Property, Plant and Equipment [Line Items]
Total	$ 2,046	$ 1,629
Furniture, equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (years)	2 years
Furniture, equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (years)	15 years