v2.4.0.6
Loans and Allowance for Credit Losses, PCI Loans Outstanding (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value $ 35,534 $ 36,719
Total PCI loans (unpaid principal balance) 53,389 55,312
Commercial and Industrial Loans [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 385 399
Commercial Real Estate Mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 3,107 3,270
Commercial Real Estate Construction [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 1,564 1,745
Foreign Loans [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 1,198 1,353
Total Commercial [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 6,254 6,767
Real estate 1-4 family first mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 29,082 29,746
Real estate 1-4 family junior lien mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 198 206
Total Consumer [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value $ 29,280 $ 29,952