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Business Segments and Revenue from Contracts with Customers - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2019
Segment
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | Segment   3  
Operating segments | Commercial Banking      
Segment Reporting Information [Line Items]      
Revenue change due to impact of federal tax rate | $ $ (26)   $ (88)