v2.4.0.8
Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2008
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 28,799 $ 30,968 $ 58,797
Loans 801,974 799,574  
Residential Mortgage [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 25,542 26,991  
Loans 322,900 325,365  
Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
0-60% 76,410 68,417  
60.01-80% 86,057 84,927  
80.01-100% 53,288 52,868  
100.01-120% 26,753 30,580  
Greater than 120% 21,898 28,139  
No LTV/CLTV Available 3,330 3,724  
Government insured/guaranteed loans 29,622 29,719  
Loans, excluding Purchased Credit Impaired Loans 297,358 298,374  
Real estate 1-4 family first mortgage [Member]
     
Loans by Loan to Value, 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 first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
0-60% 64,707 56,247  
60.01-80% 70,525 69,759  
80.01-100% 36,177 34,830  
100.01-120% 14,559 17,004  
Greater than 120% 10,087 13,529  
No LTV/CLTV Available 1,756 1,973  
Government insured/guaranteed loans 29,622 29,719  
Loans, excluding Purchased Credit Impaired Loans 227,433 223,061  
Real estate 1-4 family junior lien mortgage [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 134 152 728
Loans 70,059 75,465  
Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
0-60% 11,703 12,170  
60.01-80% 15,532 15,168  
80.01-100% 17,111 18,038  
100.01-120% 12,194 13,576  
Greater than 120% 11,811 14,610  
No LTV/CLTV Available 1,574 1,751  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans $ 69,925 $ 75,313