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MORTGAGE BANKING AND OTHER - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]      
MSR portfolio fair value $ 902   $ 658
Weighted average life (in years) 5 years 8 months 12 days 4 years 2 months 12 days  
Weighted average constant prepayment rate (1) 11.90% 17.30%  
Weighted average option adjusted spread 5.81% 5.95%  
Minimum      
Servicing Assets at Fair Value [Line Items]      
Sensitivity analysis, basis spread 0.50% 0.50%  
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 $ 129 $ 122  
Decline in fair value due to 50 bps decrease in option adjusted spread $ 18 $ 12  
Maximum      
Servicing Assets at Fair Value [Line Items]      
Sensitivity analysis, basis spread 1.00% 1.00%  
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 $ 273 $ 202  
Decline in fair value due to 100 bps decrease in option adjusted spread $ 36 $ 24