Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio (Details)

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio (Details) - Residential Mortgage - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Servicing Asset at Amortized Cost [Line Items]        
Loans sold with servicing retained $ 897 $ 798 $ 1,740 $ 1,646
Pretax gains resulting from above loan sales $ 19 $ 17 $ 40 $ 39