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MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract]    
MSR portfolio fair value $ 243 $ 218
Weighted average life (in years) 6 years 6 months 5 years 10 months 24 days
Weighted average constant prepayment rate 8.50% 10.00%
Weighted average discount rate 9.30% 9.90%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Fair value $ 600  
Weighted-average life (in years) 8 years  
Weighted-average constant prepayment rate 8.20%  
Weighted average option adjusted spread 6.09%  
Minimum    
Servicing Assets at Fair Value [Line Items]    
Sensitivity analysis, basis spread 0.50% 0.50%
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract]    
Decline in fair value due to 50 bps decrease in prepayment rate $ 24 $ 22
Decline in fair value due to 50 bps decrease in discount rate 5 $ 4
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Decline in fair value due to 50 bps decrease in prepayment rate 68  
Decline in fair value due to 50 bps decrease in option adjusted spread $ 13  
Maximum    
Servicing Assets at Fair Value [Line Items]    
Sensitivity analysis, basis spread 1.00% 1.00%
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract]    
Decline in fair value due to 100 bps decrease in prepayment rate $ 56 $ 46
Decline in fair value due to 100 bps decrease in discount rate 9 $ 8
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Decline in fair value due to 100 bps decrease in prepayment rate 148  
Decline in fair value due to 100 bps decrease in option adjusted spread $ 26