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MORTGAGE BANKING AND OTHER SERVICED LOANS - Changes Related to MSRs - Amortization Method (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Education    
Servicing Asset at Amortized Cost [Line Items]    
Other serviced loans $ 341 $ 420
Commercial and Industrial    
Servicing Asset at Amortized Cost [Line Items]    
Other serviced loans $ 84 $ 92