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Loans (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans $ 1,168 $ 1,102
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 132 121
Commercial loans [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 473 473
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 29 20
Commercial loans [Member] | Construction and other real estate [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 353 342
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 26 17
Commercial loans [Member] | Business banking and middle markets enterprises [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 86 94
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 3 3
Commercial loans [Member] | Global banking [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans      
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans      
Commercial loans [Member] | Other commercial [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 34 37
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans      
Consumer loans [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 695 629
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 103 101
Consumer loans [Member] | Residential mortgages [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 677 608
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans 97 94
Consumer loans [Member] | Credit cards [Member]
   
Summary of troubled debt restructurings loans and the related credit loss reserves for troubled debt restructurings loans    
TDR Loans 18 21
Allowance for credit losses for TDR Loans    
Allowance for credit losses on TDR Loans $ 6 $ 7