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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Significant Accounting Policies [Abstract]  
Components of Operating Expenses
Operating expenses for the three years ended December 31, 2013 were (in millions):
 
2013
 
2012
 
2011
 
 
 
 
 
 
Salary and service costs
$
10,724.4

 
$
10,406.8

 
$
10,276.9

Office and general expenses
1,993.4

 
2,008.4

 
1,924.5

Merger expenses
41.4

 
—

 
—

Operating expenses
$
12,759.2

 
$
12,415.2

 
$
12,201.4