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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Share (Tables) [Abstract] 
Weighted average shares outstanding
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions)
 
2011
 
2010
 
2011
 
2010
Weighted average shares outstanding - basic
 
1,514.4

 
1,519.8

 
1,523.1

 
1,517.0

Net effect of common stock equivalents
 
9.6

 
9.5

 
8.9

 

Weighted average shares outstanding - assuming dilution
 
1,524.0

 
1,529.3

 
1,532.0

 
1,517.0