v2.4.0.8
Loans and Allowance for Credit Losses, PCI Loans Outstanding (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2008
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 28,799 $ 30,968 $ 58,797
Total PCI loans (unpaid principal balance) 41,380 45,174 98,182
Total Commercial [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 3,257 3,977 18,704
Commercial and Industrial Loans [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 195 259 4,580
Commercial Real Estate Mortgage [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 1,746 1,970 5,803
Commercial Real Estate Construction [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 602 877 6,462
Foreign Loans [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 714 871 1,859
Total Consumer [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 25,542 26,991 40,093
Real estate 1-4 family first mortgage [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 25,408 26,839 39,214
Real estate 1-4 family junior lien mortgage [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 134 152 728
Automobile [Member]
     
PCI loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 0 $ 0 $ 151