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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Share (Tables) [Abstract]  
Weighted average shares outstanding
 
 
Year Ended
December 31,
(in millions)
 
2011
2010
2009
Weighted average shares outstanding - basic
 
1,509.3

1,517.8

1,507.9

Net effect of common stock equivalents
 
9.7





Weighted average shares outstanding - assuming dilution
 
1,519.0

1,517.8

1,507.9