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PREMISES, EQUIPMENT, AND SOFTWARE - Schedule of Premises and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 1,596 $ 1,853
Accumulated depreciation (837) (1,092)
Total premises and equipment, net 759 761
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 102 102
Land and land improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life 10 years  
Land and land improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life 75 years  
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 800 848
Buildings and leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Buildings and leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life 60 years  
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 644 535
Furniture, fixtures and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life 4 years  
Furniture, fixtures and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life 20 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total premises and equipment, gross $ 50 $ 368