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Loans and Allowance for Credit Losses (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 203,222 $ 188,188
30-89 Days Past Due 1,782 2,626
90 Days or More Past Due 1,753 2,184
Non performing 3,078 4,063
Total 209,835 197,061
Commercial Loan [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 55,991 47,412
30-89 Days Past Due 300 325
90 Days or More Past Due 45 64
Non performing 312 597
Total 56,648 48,398
Commercial Real Estate Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 34,800 32,986
30-89 Days Past Due 138 415
90 Days or More Past Due 14 1
Non performing 899 1,293
Total 35,851 34,695
Residential Mortgage [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 35,664 29,140
30-89 Days Past Due 404 456
90 Days or More Past Due 364 500
Non performing 650 636
Total 37,082 30,732
Credit Card [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 16,662 15,993
30-89 Days Past Due 238 269
90 Days or More Past Due 236 313
Non performing 224 228
Total 17,360 16,803
Other Retail [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 47,516 47,706
30-89 Days Past Due 340 404
90 Days or More Past Due 184 216
Non performing 67 65
Total 48,107 48,391
Total Loans, Excluding Covered Loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 190,633 173,237
30-89 Days Past Due 1,420 1,869
90 Days or More Past Due 843 1,094
Non performing 2,152 2,819
Total 195,048 179,019
Covered Financing Receivable [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,589 14,951
30-89 Days Past Due 362 757
90 Days or More Past Due 910 1,090
Non performing 926 1,244
Total $ 14,787 $ 18,042