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MORTGAGE BANKING AND OTHER - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]    
Fair value $ 1,411 $ 1,029
Weighted average life (years) 8 years 6 months 6 years 4 months 24 days
Weighted average constant prepayment rate 7.60% 10.70%
Weighted average option adjusted spread 6.15% 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 $ 24 $ 45
Decline in fair value from 10% adverse change $ 39 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 $ 59 87
Decline in fair value from 20% adverse change $ 77 $ 50