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Loans - Summary of Receivables which were Modified and as Result Became Classified as TDR Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans $ 15 $ 136 $ 369 $ 276
Commercial Loans [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 0 87 304 154
Commercial Loans [Member] | Construction and Other Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 0 0 0 4
Commercial Loans [Member] | Business and Corporate Banking [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 0 87 304 137
Commercial Loans [Member] | Global Banking [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 0 0 0 13
Consumer Loans [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 15 49 65 122
Consumer Loans [Member] | Residential Mortgage [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 12 47 55 117
Consumer Loans [Member] | Home Equity Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans 2 1 7 2
Consumer Loans [Member] | Credit Cards [Member]        
Financing Receivable, Impaired [Line Items]        
Loans which were modified and as a result became classified as TDR Loans $ 1 $ 1 $ 3 $ 3