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MORTGAGE BANKING AND OTHER SERVICED LOANS - Residential Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash proceeds from residential mortgage loans sold with servicing retained $ 9,124 $ 17,025 $ 37,039
Repurchased residential mortgages 0 87 1,381
Mortgage Banking Fees      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales 72 86 382
Contractually specified servicing, late and other ancillary fees $ 309 $ 287 $ 247