v2.4.0.8
Loans and Allowance for Credit Losses, Loans by FICO Score, Consumer (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2008
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 28,799 $ 30,968 $ 58,797
Loans 801,974 799,574  
Total Consumer [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 25,542 26,991 40,093
Loans 438,502 438,376  
Real estate 1-4 family first mortgage [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 25,408 26,839 39,214
Loans 252,841 249,900  
Real estate 1-4 family junior lien mortgage [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 134 152 728
Loans 70,059 75,465  
Credit Card [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0  
Loans 24,815 24,640  
Automobile [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0 151
Loans 48,648 45,998  
Other revolving credit and installment [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0  
Loans 42,139 42,373  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 32,259 35,189  
600-639 21,909 22,232  
640-679 36,234 36,263  
680-719 52,733 52,716  
720-759 63,589 63,337  
760-799 104,519 102,300  
Greater than 800 48,132 43,148  
No FICO available 7,535 8,632  
FICO not required 4,912 5,403  
Government insured/guaranteed loans 41,138 42,165  
Loans, excluding Purchased Credit Impaired Loans 412,960 411,385  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 15,868 17,662  
600-639 9,727 10,208  
640-679 15,456 15,764  
680-719 24,695 24,725  
720-759 32,563 31,502  
760-799 67,997 63,946  
Greater than 800 28,477 26,044  
No FICO available 3,028 3,491  
FICO not required 0 0  
Government insured/guaranteed loans 29,622 29,719  
Loans, excluding Purchased Credit Impaired Loans 227,433 223,061  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 5,199 6,122  
600-639 3,445 3,660  
640-679 6,318 6,574  
680-719 10,764 11,361  
720-759 14,848 15,992  
760-799 20,326 21,874  
Greater than 800 7,967 8,526  
No FICO available 1,058 1,204  
FICO not required 0 0  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 69,925 75,313  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 2,239 2,314  
600-639 1,986 1,961  
640-679 3,791 3,772  
680-719 4,996 4,990  
720-759 5,089 5,114  
760-799 4,082 4,109  
Greater than 800 2,115 2,223  
No FICO available 517 157  
FICO not required 0 0  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 24,815 24,640  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 8,077 7,928  
600-639 5,829 5,451  
640-679 8,713 8,142  
680-719 8,674 7,949  
720-759 6,242 5,787  
760-799 5,892 5,400  
Greater than 800 4,928 4,443  
No FICO available 293 898  
FICO not required 0 0  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 48,648 45,998  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
     
Loans by FICO, Excluding Purchased Credit Impaired Loans [Abstract]      
Less than 600 876 1,163  
600-639 922 952  
640-679 1,956 2,011  
680-719 3,604 3,691  
720-759 4,847 4,942  
760-799 6,222 6,971  
Greater than 800 4,645 1,912  
No FICO available 2,639 2,882  
FICO not required 4,912 5,403  
Government insured/guaranteed loans 11,516 12,446  
Loans, excluding Purchased Credit Impaired Loans $ 42,139 $ 42,373