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MORTGAGE BANKING AND OTHER - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Fair value $ 1,524 $ 1,029
Weighted average life (years) 9 years 2 months 12 days 6 years 4 months 24 days
Weighted average constant prepayment rate 6.80% 10.70%
Weighted average option adjusted spread 6.27% 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 from 10% adverse change $ 34 $ 45
Decline in fair value from 10% adverse change $ 42 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 from 20% adverse change $ 66 87
Decline in fair value from 20% adverse change $ 85 $ 50