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MORTGAGE BANKING AND OTHER - Residential Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash proceeds from residential mortgage loans sold with servicing retained $ 37,039 $ 33,221 $ 20,430
Repurchased residential mortgages(1) 1,381 0 0
Mortgage Banking Fees      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on sales 382 895 251
Contractually specified servicing, late and other ancillary fees $ 247 $ 227 $ 208