Earnings Per Share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per Share

Basic EPS is calculated using the weighted average number of shares outstanding during each period. The diluted EPS calculation includes the impact of dilutive equity compensation awards.

EPS calculations have been made using the following share information (in millions):

	Three Months Ended March 31,
	2013	2012
Weighted average shares
Basic shares	120	121
Effect of dilutive securities	1	1
Diluted shares	121	122

Potential common shares totaling 1 million were excluded from the calculation of diluted weighted average shares for the three months ended March 31, 2013, because their effects were antidilutive. There were no common shares excluded from the calculation of diluted weighted average shares for the three months ended March 31, 2012.