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MORTGAGE BANKING AND OTHER - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Fair value $ 1,029 $ 658
Weighted-average life (in years) 6 years 4 months 24 days 4 years 2 months 12 days
Weighted-average constant prepayment rate 10.70% 17.30%
Weighted average option adjusted spread 5.95% 5.96%
Minimum    
Servicing Assets at Fair Value [Line Items]    
Sensitivity analysis, basis spread 10.00%  
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 $ 45 $ 43
Decline in fair value due to 50 bps decrease in option adjusted spread $ 25 14
Maximum    
Servicing Assets at Fair Value [Line Items]    
Sensitivity analysis, basis spread 20.00%  
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 $ 87 92
Decline in fair value due to 100 bps decrease in option adjusted spread $ 50 $ 29