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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details) - Residential mortgage - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Servicing Asset at Amortized Cost [Line Items]    
Loans sold with servicing retained $ 862 $ 1,934
Pretax gains resulting from above loan sales $ 7 $ 59