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, 2019
Dec. 31, 2018
Dec. 31, 2017
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Servicing Asset at Fair Value, Other Changes in Fair Value $ 7 $ 10  
Servicing Asset at Fair Value, Period Increase (Decrease) 3 1  
Servicing, late and other ancillary fees included in mortgage banking income 63 60 $ 56
Unpaid principal balance of third party serviced loans $ 22,400 $ 21,000 $ 19,800