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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Residential Mortgage          
Servicing Assets at Fair Value [Line Items]          
Servicing income $ 13 $ 12 $ 36 $ 35  
Unpaid principal balance of third party serviced loans 18,600   18,600   $ 16,200
Automobile          
Servicing Assets at Fair Value [Line Items]          
Servicing income 2 4 6 11  
Unpaid principal balance of third party serviced loans 400   400   900
Small Business Association (SBA) Loan          
Servicing Assets at Fair Value [Line Items]          
Servicing income 2 $ 2 7 $ 6  
Unpaid principal balance of third party serviced loans $ 1,100   $ 1,100   $ 1,000