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Loans - Summary of Past Due Status of Loans (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days $ 461 $ 588  
Days Past Due, 90 + days 1,135 1,229  
Total Past Due 1,596 1,817  
Current 67,301 [1] 65,878 [1]  
Total loans 68,897 67,695 62,932
Commercial Loan [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 51 89  
Days Past Due, 90 + days 60 106  
Total Past Due 111 195  
Current 49,782 [1] 48,299 [1]  
Total loans 49,893 48,494  
Commercial Loan [Member] | Construction and Other Real Estate [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 8 6  
Days Past Due, 90 + days 30 58  
Total Past Due 38 64  
Current 9,127 [1] 8,970 [1]  
Total loans 9,165 9,034 8,319
Commercial Loan [Member] | Business and Corporate Banking [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 17 48  
Days Past Due, 90 + days 27 36  
Total Past Due 44 84  
Current 15,654 [1] 14,362 [1]  
Total loans 15,698 14,446 12,725
Commercial Loan [Member] | Global Banking [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 0 8  
Days Past Due, 90 + days 3 3  
Total Past Due 3 11  
Current 21,976 [1] 21,614 [1]  
Total loans 21,979 21,625 19,718
Commercial Loan [Member] | Other Commercial [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 26 27  
Days Past Due, 90 + days 0 9  
Total Past Due 26 36  
Current 3,025 [1] 3,353 [1]  
Total loans 3,051 3,389 2,877
Consumer Loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 410 499  
Days Past Due, 90 + days 1,075 1,123  
Total Past Due 1,485 1,622  
Current 17,519 [1] 17,579 [1]  
Total loans 19,004 19,201  
Consumer Loans [Member] | Residential Mortgage [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 366 443  
Days Past Due, 90 + days 996 1,037  
Total Past Due 1,362 1,480  
Current 14,538 [1] 14,346 [1]  
Total loans 15,900 15,826 15,730
Consumer Loans [Member] | Home Equity Mortgages [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 22 28  
Days Past Due, 90 + days 53 59  
Total Past Due 75 87  
Current 1,863 [1] 1,924 [1]  
Total loans 1,938 2,011 2,236
Consumer Loans [Member] | Credit Cards [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 12 16  
Days Past Due, 90 + days 14 14  
Total Past Due 26 30  
Current 657 [1] 824 [1]  
Total loans 683 854 749
Consumer Loans [Member] | Other consumer
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 30-89 days 10 12  
Days Past Due, 90 + days 12 13  
Total Past Due 22 25  
Current 461 [1] 485 [1]  
Total loans $ 483 $ 510 $ 578
[1] Loans less than 30 days past due are presented as current.