Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Small Business Association Portfolio, MSRs Amortization Method (Details)

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LOAN SALES AND SECURITIZATIONS - Small Business Association Portfolio, MSRs Amortization Method (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Fair value, end of period $ 248   $ 248   $ 238
Small Business Association (SBA) Loan          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Carrying value, beginning of period 28 $ 21 27 $ 21  
New servicing assets created 3 4 5 6  
Amortization and other (3) (2) (4) (4)  
Carrying value, end of period 28 23 28 23  
Fair value, end of period $ 33 $ 27 $ 33 $ 27  
Weighted-average life (years) 3 years 5 months 3 years 4 months 3 years 5 months 3 years 4 months