v2.4.0.6
Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Commercial (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
90+ DPD and still accruing $ 23,245 $ 22,569      
Purchased Credit Impaired Loans 30,968 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 still accruing 6,000 8,700      
Commercial and Industrial Loans [Member]
          
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
Purchased Credit Impaired Loans 259 399 718 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 235 359      
30-89 DPD and still accruing 1 22      
90+ DPD and still accruing 23 18      
Purchased Credit Impaired Loans 259 399      
Commercial Real Estate Mortgage [Member]
          
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
Purchased Credit Impaired Loans 1,970 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 1,804 2,867      
30-89 DPD and still accruing 26 178      
90+ DPD and still accruing 140 225      
Purchased Credit Impaired Loans 1,970 3,270      
Commercial Real Estate Construction [Member]
          
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
Purchased Credit Impaired Loans 877 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 699 1,206      
30-89 DPD and still accruing 51 72      
90+ DPD and still accruing 127 467      
Purchased Credit Impaired Loans 877 1,745      
Foreign Loans [Member]
          
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
Purchased Credit Impaired Loans 871 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 704 1,178      
30-89 DPD and still accruing 0 0      
90+ DPD and still accruing 167 175      
Purchased Credit Impaired Loans 871 1,353      
Total Commercial [Member]
          
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]          
Purchased Credit Impaired Loans 3,977 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 3,442 5,610      
30-89 DPD and still accruing 78 272      
90+ DPD and still accruing 457 885      
Purchased Credit Impaired Loans $ 3,977 $ 6,767