Annual report pursuant to Section 13 and 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method (Details) - Residential Mortgage - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Carrying value, beginning of year $ 191 $ 172
New servicing assets created 44 44
Impairment recovery (charge) (6) (1)
Amortization and other (30) (26)
Carrying value, end of year 211 191
Fair value, end of year $ 212 $ 191
Sensitivity Analysis Amortization Carrying Method    
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Weighted-average life (years) 6 years 8 months 7 years 1 month