Quarterly report pursuant to Section 13 or 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details) - Commercial Loan [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Servicing Asset at Amortized Cost [Line Items]        
Loans sold with servicing retained $ 954 $ 897 $ 1,787 $ 1,740
Pretax gains resulting from above loan sales $ 23 $ 19 $ 35 $ 40