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Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share (Tables) [Abstract]  
Weighted average shares outstanding
 
 
Year Ended December 31,
(in millions)
 
2014
 
2013
 
2012
Weighted average shares outstanding - basic
 
1,324.3

 
1,341.2

 
1,406.7

Net effect of common stock equivalents
 
—

 
—

 
—

Weighted average shares outstanding - assuming dilution
 
1,324.3

 
1,341.2

 
1,406.7