Annual report pursuant to Section 13 and 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details) - Residential mortgage - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets [Line Items]      
Servicing, late and other ancillary fees included in mortgage banking income $ 64 $ 63 $ 60
Unpaid principal balance of third party serviced loans $ 23,500 $ 22,400 $ 21,000