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MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract]    
MRS portfolio fair value $ 224 $ 243
Weighted average life (in years) 6 years 1 month 10 days 6 years 6 months
Weighted average constant prepayment rate 9.60% 8.50%
Weighted average discount rate 9.30% 9.30%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
MSR portfolio fair value $ 563 $ 600
Weighted average life (in years) 6 years 8 months 12 days 8 years
Weighted average constant prepayment rate 10.70% 8.20%
Weighted average option adjusted spread 5.68% 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 $ 27 $ 24
Decline in fair value due to 50 bps decrease in discount rate 4 5
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 81 68
Decline in fair value due to 50 bps decrease in option adjusted spread $ 11 $ 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 $ 58 $ 56
Decline in fair value due to 100 bps decrease in discount rate 8 9
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 177 148
Decline in fair value due to 100 bps decrease in option adjusted spread $ 22 $ 26