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Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans $ 1,790 $ 1,828
Total accruing loans contractually past due 90 days or more 51 61
Total nonperforming loans 1,841 1,889
Nonaccrual loans held for sale [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 51 91
Commercial Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 658 825
Total accruing loans contractually past due 90 days or more 9 14
Commercial Loans [Member] | Construction and land loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 98 103
Commercial Loans [Member] | Other real estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 353 512
Total accruing loans contractually past due 90 days or more 1 1
Commercial Loans [Member] | Business Banking and Middle Markets Enterprises [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 46 58
Total accruing loans contractually past due 90 days or more 7 11
Commercial Loans [Member] | Global Banking [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 142 137
Commercial Loans [Member] | Other Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 19 15
Total accruing loans contractually past due 90 days or more 1 2
Consumer Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 1,081 912
Total accruing loans contractually past due 90 days or more 42 47
Consumer Loans [Member] | Residential Mortgage [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 979 815
Consumer Loans [Member] | Home Equity Mortgages [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 97 89
Consumer Loans [Member] | Total residential mortgages [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 1,076 904
Consumer Loans [Member] | Other Consumer [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccruing loans 5 8
Total accruing loans contractually past due 90 days or more 27 27
Consumer Loans [Member] | Credit Card Receivables [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total accruing loans contractually past due 90 days or more $ 15 $ 20