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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2013
Short-Term Borrowings  
Summary of Short-Term Borrowings and Weighted-Average Rates
A summary of short-term borrowings and weighted-average rates follows:
       
  2013 2012
($ in millions) Amount Rate AmountRate
As of December 31:      
Federal funds purchased$2840.03%$9010.10%
Other short-term borrowings 1,3800.09 6,2800.15
Average for the years ended December 31:      
Federal funds purchased$5030.12%$5600.14%
Other short-term borrowings 3,0240.18 4,2460.18
Maximum month-end balance for the years ended December 31:      
Federal funds purchased$925 $901 
Other short-term borrowings 8,001  6,330