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) - Commercial Loan [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Servicing Asset at Amortized Cost [Line Items]        
Loans sold with servicing retained $ 1,047 $ 1,179 $ 2,787 $ 2,824
Pretax gains resulting from above loan sales $ 24 $ 27 $ 64 $ 66