v2.4.0.6
Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Commercial (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
90+ DPD and accruing $ 22,569 $ 18,488    
Purchased Credit Impaired Loans 36,719 41,430 51,705 58,797
Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
90+ DPD and accruing 8,700 11,600    
Commercial and Industrial Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Purchased Credit Impaired Loans 399 718 1,911 4,580
Commercial and Industrial Loans [Member] | Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Current-29 DPD and still accruing 359 612    
30-89 DPD and still accruing 22 22    
90+ DPD and accruing 18 84    
Commercial Real Estate Mortgage [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Purchased Credit Impaired Loans 3,270 2,855 4,137 5,803
Commercial Real Estate Mortgage [Member] | Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Current-29 DPD and still accruing 2,867 2,295    
30-89 DPD and still accruing 178 113    
90+ DPD and accruing 225 447    
Commercial Real Estate Construction [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Purchased Credit Impaired Loans 1,745 2,949 5,207 6,462
Commercial Real Estate Construction [Member] | Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Current-29 DPD and still accruing 1,206 1,395    
30-89 DPD and still accruing 72 178    
90+ DPD and accruing 467 1,376    
Foreign Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Purchased Credit Impaired Loans 1,353 1,413 1,733 1,859
Foreign Loans [Member] | Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Current-29 DPD and still accruing 1,178 1,209    
30-89 DPD and still accruing 0 0    
90+ DPD and accruing 175 204    
Total Commercial [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Purchased Credit Impaired Loans 6,767 7,935 12,988 18,704
Total Commercial [Member] | Purchased Credit-Impaired Loans [Member]
        
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]        
Current-29 DPD and still accruing 5,610 5,511    
30-89 DPD and still accruing 272 313    
90+ DPD and accruing $ 885 $ 2,111