v2.4.0.6
Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Consumer (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 29,729 $ 30,968 $ 58,797
Residential Mortgage [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Purchased Credit Impaired Loans (carrying value) 26,227 26,991  
Residential Mortgage [Member] | Purchased Credit-Impaired Loans [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Current-29 DPD and still accruing 21,796 22,502  
30-59 DPD and still accruing 2,350 2,598  
60-89 DPD and still accruing 1,248 1,368  
90-119 DPD and still accruing 558 656  
120-179 DPD and still accruing 713 811  
180+ DPD and still accruing 5,354 5,472  
Total consumer PCI loans (adjusted unpaid principal balance) 32,019 33,407  
Purchased Credit Impaired Loans (carrying value) 26,227 26,991  
Real estate 1-4 family first mortgage [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Purchased Credit Impaired Loans (carrying value) 26,086 26,839 39,214
Real estate 1-4 family first mortgage [Member] | Purchased Credit-Impaired Loans [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Current-29 DPD and still accruing 21,608 22,304  
30-59 DPD and still accruing 2,341 2,587  
60-89 DPD and still accruing 1,243 1,361  
90-119 DPD and still accruing 555 650  
120-179 DPD and still accruing 706 804  
180+ DPD and still accruing 5,245 5,356  
Total consumer PCI loans (adjusted unpaid principal balance) 31,698 33,062  
Purchased Credit Impaired Loans (carrying value) 26,086 26,839  
Real estate 1-4 family junior lien mortgage [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Purchased Credit Impaired Loans (carrying value) 141 152 728
Real estate 1-4 family junior lien mortgage [Member] | Purchased Credit-Impaired Loans [Member]
      
Purchased Credit Impaired Loans by Consumer Days Past Due [Abstract]      
Current-29 DPD and still accruing 188 198  
30-59 DPD and still accruing 9 11  
60-89 DPD and still accruing 5 7  
90-119 DPD and still accruing 3 6  
120-179 DPD and still accruing 7 7  
180+ DPD and still accruing 109 116  
Total consumer PCI loans (adjusted unpaid principal balance) 321 345  
Purchased Credit Impaired Loans (carrying value) $ 141 $ 152