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Fair Value Disclosures (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Disclosures  
Schedule of Assets and Liabilities Measured at Fair Value
Roll Forward of Level 3 Assets and Liabilities
Fair Value and Unpaid Principal Balance of Loans Held for Sale
Carrying Amounts and Fair Values of Financial Assets and Liabilities Not Recorded at Fair Value
Notional or Contractual Amounts and Fair Values of Off Balance-Sheet Financial Instruments
    June 30, 2011     December 31, 2010  
    Notional/
Contract
Amount
    Fair Value     Notional/
Contract
Amount
    Fair Value  
    (Dollars in millions)  

Contractual commitments:

       

Commitments to extend, originate or purchase credit

  $ 38,703      $ 68      $ 36,917     $ 65  

Residential mortgage loans sold with recourse

    1,464       7        1,624       6  

Other loans sold with recourse

    4,535       21        4,352       19  

Letters of credit and financial guarantees written

    6,387        42        7,291       41  

Commitments to fund affordable housing investments

    296       280       334       316