Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Narrative (Details)

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LOAN SALES AND SECURITIZATIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Residential Mortgage      
Servicing Assets at Fair Value [Line Items]      
Servicing income $ 15 $ 14  
Unpaid principal balance of third party serviced loans 20,100   $ 19,800
Automobile      
Servicing Assets at Fair Value [Line Items]      
Servicing income 3 5  
Unpaid principal balance of third party serviced loans 900   1,000
Small Business Association (SBA) Loan      
Servicing Assets at Fair Value [Line Items]      
Servicing income 3 $ 3  
Unpaid principal balance of third party serviced loans $ 1,500   $ 1,400