Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

The following table summarizes the calculation of basic and diluted earnings per share:

	Year Ended December 31,
	2011		2010		2009
(millions, except per share amounts)
Net Income (Loss)		453		725		(131	)

Weighted Average Number of Shares Outstanding, Basic		176		175		173
Incremental Shares from Assumed Conversion of
Dilutive Options and Restricted Stock		3		2		-
Weighted Average Number of Shares Outstanding, Diluted		179		177		173
Earnings (Loss) Per Share, Basic	$	2.57	$	4.15	$	(0.75	)
Earnings (Loss) Per Share, Diluted		2.54		4.10		(0.75	)

Additional Information
Antidilutive stock options and shares of restricted stock		2		2		4
Weighted average option exercise price per share	$	85.40	$	74.01	$	60.40

Incremental stock options and shares of restricted stock excluded from calculation of diluted earnings in loss period		-		-		2