PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total	$ 3,634	$ 3,272
Less accumulated depreciation and amortization	1,628	1,395
Premises and equipment, net	2,006	1,877
Land
Property, Plant and Equipment [Line Items]
Total	407	403
Premises and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	$ 1,598	1,609
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	$ 1,629	$ 1,260
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