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Loans and Loans Held for Sale - Loans Held for Sale (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial and industrial $ 34     $ 19  
Real estate — construction 0     1  
Commercial lease financing 1     0  
Total loans held for sale 1,341 [1] $ 1,743 $ 1,384 1,104 [1] $ 1,137
Commercial Mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Real estate 1,246     1,022  
Residential Mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Real estate 60 $ 63   62  
Total loans held for sale $ 60     $ 62  
[1] Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $60 million at September 30, 2017, and $62 million at December 31, 2016.