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Goodwill (Tables)
9 Months Ended
Sep. 30, 2013
Intangible Assets  
Changes in the Net Carrying Amount of Goodwill by Reporting Segment
Changes in the net carrying amount of goodwill, by reporting unit, for the nine months ended September 30, 2013 and 2012 were as follows:
       
  CommercialBranchConsumerInvestment 
($ in millions) BankingBankingLendingAdvisorsTotal
Net carrying value as of December 31, 2012$6131,655 - 1482,416
Acquisition activity -- - - -
Net carrying value as of September 30, 2013$6131,655 - 1482,416
       
Net carrying value as of December 31, 2011 6131,656 - 1482,417
Acquisition activity  - - - - -
Net carrying value as of September 30, 2012$6131,656 - 1482,417