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Commitments, Contingencies and Guarantees (Tables)
6 Months Ended
Jun. 30, 2013
Commitments And Contingencies Disclosure [Abstract]  
Summary of Commitments

 

 

(Dollars in millions)   June 30, 2013  

Commitments to extend credit

  $ 30,455  

Standby and commercial letters of credit

    5,882  

Other commitments

    240