v2.4.0.8
Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Commercial (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2008
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
90+ DPD and still accruing $ 22,197 $ 23,245  
Purchased Credit Impaired Loans 28,799 30,968 58,797
Purchased Credit-Impaired Loans [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
90+ DPD and still accruing 5,400 6,000  
Total Commercial [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
Purchased Credit Impaired Loans 3,257 3,977 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 2,805 3,442  
30-89 DPD and still accruing 101 78  
90+ DPD and still accruing 351 457  
Purchased Credit Impaired Loans 3,257 3,977  
Commercial and Industrial Loans [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
Purchased Credit Impaired Loans 195 259 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 186 235  
30-89 DPD and still accruing 3 1  
90+ DPD and still accruing 6 23  
Purchased Credit Impaired Loans 195 259  
Commercial Real Estate Mortgage [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
Purchased Credit Impaired Loans 1,746 1,970 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 1,596 1,804  
30-89 DPD and still accruing 69 26  
90+ DPD and still accruing 81 140  
Purchased Credit Impaired Loans 1,746 1,970  
Commercial Real Estate Construction [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
Purchased Credit Impaired Loans 602 877 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 483 699  
30-89 DPD and still accruing 18 51  
90+ DPD and still accruing 101 127  
Purchased Credit Impaired Loans 602 877  
Foreign Loans [Member]
      
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]      
Purchased Credit Impaired Loans 714 871 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 540 704  
30-89 DPD and still accruing 11 0  
90+ DPD and still accruing 163 167  
Purchased Credit Impaired Loans $ 714 $ 871