Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Small Business Association Portfolio (Details)

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LOAN SALES AND SECURITIZATIONS - Small Business Association Portfolio (Details) - Commercial - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Residential mortgage loans sold with servicing retained $ 413 $ 270 $ 233
Pretax gains resulting from above loan sales $ 32 $ 21 $ 19