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Loans - Summary of Past Due Status of Loans (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days $ 1,989 $ 2,273  
Days Past Due, 30-89 days 663 813  
Days Past Due, 90 + days 1,231 1,356  
Total Past Due 3,883 4,442  
Current 57,569 47,425  
Total 61,452 51,867 49,600
Commercial Loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 1,469 1,935  
Days Past Due, 30-89 days 163 207  
Days Past Due, 90 + days 191 397  
Total Past Due 1,823 2,539  
Current 40,745 31,110  
Total 42,568 33,649  
Commercial Loans [Member] | Construction and Other Real Estate [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 94 72  
Days Past Due, 30-89 days 72 31  
Days Past Due, 90 + days 105 231  
Total Past Due 271 334  
Current 7,649 7,526  
Total 7,920 7,860 7,773
Commercial Loans [Member] | Business Banking and Middle Markets Enterprises [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 486 615  
Days Past Due, 30-89 days 82 58  
Days Past Due, 90 + days 52 71  
Total Past Due 620 744  
Current 11,877 9,481  
Total 12,497 10,225 9,997
Commercial Loans [Member] | Global Banking [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 284 898  
Days Past Due, 30-89 days   34  
Days Past Due, 90 + days 8 74  
Total Past Due 292 1,006  
Current 18,719 11,652  
Total 19,011 12,658 12,055
Commercial Loans [Member] | Other Commercial [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 605 350  
Days Past Due, 30-89 days 9 84  
Days Past Due, 90 + days 26 21  
Total Past Due 640 455  
Current 2,500 2,451  
Total 3,140 2,906 1,794
Consumer Loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 520 338  
Days Past Due, 30-89 days 500 606  
Days Past Due, 90 + days 1,040 959  
Total Past Due 2,060 1,903  
Current 16,824 16,315  
Total 18,884 18,218  
Consumer Loans [Member] | Home Equity Mortgages [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 380 181  
Days Past Due, 30-89 days 20 54  
Days Past Due, 90 + days 86 89  
Total Past Due 486 324  
Current 1,901 2,239  
Total 2,387 2,563 2,618
Consumer Loans [Member] | Other Residential Mortgages [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 104 109  
Days Past Due, 30-89 days 460 526  
Days Past Due, 90 + days 907 815  
Total Past Due 1,471 1,450  
Current 13,615 12,663  
Total 15,086 14,113  
Consumer Loans [Member] | Credit Card Receivables [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 29 37  
Days Past Due, 30-89 days 15 20  
Days Past Due, 90 + days 15 20  
Total Past Due 59 77  
Current 737 751  
Total 796 828 788
Consumer Loans [Member] | Other Consumer [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Days Past Due, 1-29 days 7 11  
Days Past Due, 30-89 days 5 6  
Days Past Due, 90 + days 32 35  
Total Past Due 44 52  
Current 571 662  
Total $ 615 $ 714 $ 733