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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2014
Short-Term Borrowings  
Summary of Short-Term Borrowings and Weighted-Average Rates
A summary of short-term borrowings and weighted-average rates follows: 
         
  2014  2013 
($ in millions) Amount Rate  AmountRate 
As of December 31:        
Federal funds purchased$1440.08%$2840.03%
Other short-term borrowings 1,5560.08  1,3800.09 
Average for the years ended December 31:        
Federal funds purchased$4580.09%$5030.12%
Other short-term borrowings 1,8730.10  3,0240.18 
Maximum month-end balance for the years ended December 31:        
Federal funds purchased$286  $925  
Other short-term borrowings 3,756   8,001