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Loans and asset quality - Information about Impaired Loans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment $ 9 $ 7 $ 24
Impaired loans without an allowance, average recorded investment 105 2 3
Total impaired loans, average recorded investment 114 9 27
Impaired loans with an allowance, interest income recognized 0 0 0
Impaired loans without an allowance, interest income recognized 0 0 0
Total impaired loans, interest income recognized 0 0 0
Impaired loans with an allowance, recorded investment 7 7  
Impaired loans without an allowance, recorded investment 2 173  
Total impaired loans, recorded investment 9 180  
Impaired loans with an allowance, unpaid Principal balance 10 10  
Impaired loans without an allowance, unpaid Principal balance 2 314  
Total impaired loans, unpaid Principal balance 12 324  
Impaired loans with an allowance, related allowance 5 2  
Commercial Borrower [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 0 0 11
Impaired loans with an allowance, interest income recognized 0 0 0
Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 1 1 2
Impaired loans without an allowance, average recorded investment 1 0 1
Impaired loans with an allowance, interest income recognized 0 0 0
Impaired loans without an allowance, interest income recognized 0 0 0
Impaired loans with an allowance, recorded investment 0 1  
Impaired loans with an allowance, unpaid Principal balance 3 3  
Impaired loans with an allowance, related allowance 0 1  
Financial institutions      
Financing Receivable, Impaired [Line Items]      
Impaired loans without an allowance, average recorded investment 102 0 0
Impaired loans without an allowance, interest income recognized 0 0 0
Impaired loans without an allowance, recorded investment 0 171  
Impaired loans without an allowance, unpaid Principal balance 0 312  
Wealth management loans and mortgages      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 5 6 8
Impaired loans without an allowance, average recorded investment 2 2 2
Impaired loans with an allowance, interest income recognized 0 0 0
Impaired loans without an allowance, interest income recognized 0 0 0
Impaired loans with an allowance, recorded investment 3 6  
Impaired loans without an allowance, recorded investment 2 2  
Impaired loans with an allowance, unpaid Principal balance 3 7  
Impaired loans without an allowance, unpaid Principal balance 2 2  
Impaired loans with an allowance, related allowance 3 1  
Lease financings      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 3 0 0
Impaired loans with an allowance, interest income recognized 0 0 0
Impaired loans with an allowance, recorded investment 4 0  
Impaired loans with an allowance, unpaid Principal balance 4 0  
Impaired loans with an allowance, related allowance 2 0  
Foreign      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 0 0 3
Impaired loans with an allowance, interest income recognized 0 0 $ 0
Loans Individually Less Than 1 Million      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, recorded investment 1 2  
Impaired loans with an allowance, related allowance 1 1  
Loans Individually Less Than 1 Million | Maximum      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, recorded investment $ 1 $ 1