Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Basic and diluted earnings per share were computed using the following common share data (shares in millions):


	Years Ended December 31,
	2015		2014		2013
Number of common shares outstanding at year-end		447.2		458.5		464.3
Effect of using weighted average common shares outstanding		5.5		4.1		3.4

Weighted average basic common shares outstanding		452.7		462.6		467.7
Dilutive effect of equity-based compensation awards and other contingently issuable shares		3.2		3.0		2.1

Weighted average diluted common shares outstanding		455.9		465.6		469.8

Potentially issuable shares		10.2		11.3		12.3
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding		2.0		0.4		0.1