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Loans - Status of Commercial Loan Portfolio (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]      
Nonaccrual Loans $ 1,175,000,000 $ 1,305,000,000  
Accruing Loans Contractually Past Due 90 days or More 34,000,000 34,000,000  
Total loans 68,897,000,000 67,695,000,000 62,932,000,000
Commercial Loan [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 49,768,000,000 48,234,000,000  
Nonaccrual Loans 118,000,000 254,000,000  
Accruing Loans Contractually Past Due 90 days or More 7,000,000 6,000,000  
Total loans 49,893,000,000 48,494,000,000  
Commercial Loan [Member] | Construction and Other Real Estate [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 9,071,000,000 8,868,000,000  
Nonaccrual Loans 94,000,000 166,000,000  
Accruing Loans Contractually Past Due 90 days or More 0 0  
Total loans 9,165,000,000 9,034,000,000 8,319,000,000
Commercial Loan [Member] | Business and Corporate Banking [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 15,671,000,000 14,420,000,000  
Nonaccrual Loans 21,000,000 21,000,000  
Accruing Loans Contractually Past Due 90 days or More 6,000,000 5,000,000  
Total loans 15,698,000,000 14,446,000,000 12,725,000,000
Commercial Loan [Member] | Global Banking [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 21,979,000,000 21,560,000,000  
Nonaccrual Loans 0 65,000,000  
Accruing Loans Contractually Past Due 90 days or More 0 0  
Total loans 21,979,000,000 21,625,000,000 19,718,000,000
Commercial Loan [Member] | Other Commercial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 3,047,000,000 3,386,000,000  
Nonaccrual Loans 3,000,000 2,000,000  
Accruing Loans Contractually Past Due 90 days or More 1,000,000 1,000,000  
Total loans $ 3,051,000,000 $ 3,389,000,000 $ 2,877,000,000