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
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Residential Mortgage      
Servicing Assets at Fair Value [Line Items]      
Servicing income $ 14 $ 12  
Unpaid principal balance of third party serviced loans 19,100   $ 18,900
Automobile      
Servicing Assets at Fair Value [Line Items]      
Servicing income 5 2  
Unpaid principal balance of third party serviced loans 1,300   1,700
Small Business Association (SBA) Loan      
Servicing Assets at Fair Value [Line Items]      
Servicing income 3 $ 2  
Unpaid principal balance of third party serviced loans $ 1,200   $ 1,100