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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 10 $ 11  
Servicing Asset at Fair Value, Period Increase (Decrease) 1 3  
Servicing, late and other ancillary fees included in mortgage banking income 60 56 $ 50
Unpaid principal balance of third party serviced loans $ 21,000 $ 19,800 $ 18,900