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MSR (Activity Related to Mortgage Banking Net Revenue) (Detail) - 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      
Residential mortgage loan sales [1] $ 5,078 $ 6,369 $ 6,927
Origination fees and gains on loan sales 100 138 186
Gross mortgage servicing fees $ 216 $ 206 $ 199
[1]

Represents the unpaid principal balance at the time of the sale .