v2.4.0.8
Loans and Allowance for Credit Losses, Commitments to Lend (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments $ 432,747 $ 423,665
Total Commercial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 249,471 239,323
Commercial and Industrial Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 222,884 215,626
Commercial Real Estate Mortgage [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 5,338 6,165
Commercial Real Estate Construction [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 9,619 9,109
Lease Financing [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 82 0
Foreign Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 11,548 8,423
Total Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 183,276 184,342
Real estate 1-4 family first mortgage [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 37,066 42,657
Real estate 1-4 family junior lien mortgage [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 48,949 50,934
Credit Card [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments 75,373 70,960
Other revolving credit and installment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total unfunded credit commitments $ 21,888 $ 19,791