v2.4.0.6
Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 29,729 $ 30,968 $ 58,797
Loans 799,966 799,574  
Residential Mortgage [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
Purchased Credit Impaired Loans (carrying value) 26,227 26,991  
Loans 324,850 325,365  
Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
     
Loans by Loan to Value, Excluding Purchased Credit Impaired Loans [Abstract]      
0-60% 70,185 68,417  
60.01-80% 85,209 84,927  
80.01-100% 53,870 52,868  
100.01-120% 29,885 30,580  
Greater than 120% 25,943 28,139  
No LTV/CLTV Available 3,164 3,724  
Government insured/guaranteed loans 30,367 29,719  
Loans, excluding Purchased Credit Impaired Loans 298,623 298,374  
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) 26,086 26,839 39,214
Loans 252,307 249,900  
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% 58,559 56,247  
60.01-80% 70,413 69,759  
80.01-100% 36,406 34,830  
100.01-120% 16,626 17,004  
Greater than 120% 12,268 13,529  
No LTV/CLTV Available 1,582 1,973  
Government insured/guaranteed loans 30,367 29,719  
Loans, excluding Purchased Credit Impaired Loans 226,221 223,061  
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) 141 152 728
Loans 72,543 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% 11,626 12,170  
60.01-80% 14,796 15,168  
80.01-100% 17,464 18,038  
100.01-120% 13,259 13,576  
Greater than 120% 13,675 14,610  
No LTV/CLTV Available 1,582 1,751  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans $ 72,402 $ 75,313