Net Income Per Common Share

12 Months Ended

Dec. 31, 2012

Net Income Per Common Share [Abstract]

Net Income Per Common Share

12.Net Income Per Common Share

Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method.The table shows calculations for basic and diluted earnings per share:

(In millions except share data in thousands)			Years ended December 31,
			2012			2011			2010
Numerator:
Net income—basic and diluted	$		421	$		164	$		375
Denominator:
Weighted-average common shares outstanding		162,504			162,667			162,778
Effect of stock-based awards:
Nonvested shares		684			509			484
Stock options		473			83			12
Adjusted diluted weighted-average shares		163,661			163,259			163,274
Earnings per share:
Basic	$		2.59	$		1.01	$		2.30
Diluted			2.57			1.01			2.30
Number of anti-dilutive stock-based awards		5,938			7,758			9,538

The current sources of dilution of our common shares are certain equity-based awards as discussed in Note 17 Stock-Based Associate Compensation Plans, Page 135. The above table includes  the number of anti‑dilutive stock-based awards at year-end 2012, 2011 and 2010. We did not include these stock-based awards in the computation of net income per common share (diluted) because their exercise would have anti-dilutive effects.