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Loans - Summary of Criticized Assets for Commercial Loans (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 83,617 $ 77,741 $ 72,198
Commercial Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 63,596 58,087  
Commercial Loans [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11,520 10,300 9,682
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 19,712 17,819 15,956
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 28,942 26,387 24,268
Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,422 3,581 $ 3,127
Commercial Loans [Member] | Criticized [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,200 3,787  
Commercial Loans [Member] | Criticized [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 373 547  
Commercial Loans [Member] | Criticized [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,511 1,261  
Commercial Loans [Member] | Criticized [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,306 1,972  
Commercial Loans [Member] | Criticized [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 10 7  
Commercial Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,308 3,082  
Commercial Loans [Member] | Special Mention [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 158 310  
Commercial Loans [Member] | Special Mention [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,060 1,001  
Commercial Loans [Member] | Special Mention [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,088 1,770  
Commercial Loans [Member] | Special Mention [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2 1  
Commercial Loans [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 885 676  
Commercial Loans [Member] | Substandard [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 213 230  
Commercial Loans [Member] | Substandard [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 447 238  
Commercial Loans [Member] | Substandard [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 218 202  
Commercial Loans [Member] | Substandard [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7 6  
Commercial Loans [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7 29  
Commercial Loans [Member] | Doubtful [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2 7  
Commercial Loans [Member] | Doubtful [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4 22  
Commercial Loans [Member] | Doubtful [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Commercial Loans [Member] | Doubtful [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 1 $ 0