Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method (Details)

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Fair value, end of year $ 238 $ 226
Residential Mortgage    
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Carrying value, beginning of year 172 143
New servicing assets created 44 38
Servicing assets acquired 0 15
Impairment recovery (charge) (1) 2
Amortization and other (26) (26)
Carrying value, end of year 191 172
Fair value, end of year $ 191 $ 173
Residential Mortgage | Sensitivity Analysis Amortization Carrying Method    
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Weighted-average life (years) 7 years 1 month 7 years 2 months