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MORTGAGE BANKING AND OTHER SERVICED LOANS - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Fair value $ 1,530 $ 1,029
Weighted-average life (in years) 9 years 1 month 6 days 6 years 4 months 24 days
Weighted-average constant prepayment rate 6.80% 10.70%
Weighted average option adjusted spread 6.29% 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 $ 34 $ 45
Decline in fair value due to 50 bps decrease in option adjusted spread $ 43 25
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 $ 66 87
Decline in fair value due to 100 bps decrease in option adjusted spread $ 86 $ 50