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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Residential Mortgage          
Servicing Assets at Fair Value [Line Items]          
Servicing income $ 14 $ 13 $ 42 $ 36  
Unpaid principal balance of third party serviced loans 19,300   19,300   $ 18,900
Automobile          
Servicing Assets at Fair Value [Line Items]          
Servicing income 4 2 14 6  
Unpaid principal balance of third party serviced loans 1,200   1,200   1,700
Small Business Association (SBA) Loan          
Servicing Assets at Fair Value [Line Items]          
Servicing income 3 $ 2 8 $ 7  
Unpaid principal balance of third party serviced loans $ 1,300   $ 1,300   $ 1,100