Earnings Per Share of Common Stock

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Earnings Per Share of Common Stock

EARNINGS PER SHARE OF COMMON STOCK

Set forth below is a reconciliation of the numerator and denominator for basic and diluted earnings per share calculations for the periods indicated:

	2011			2010			2009
Numerator:
Net income attributable to DuPont	$	3,474		$	3,031		$	1,755
Preferred dividends	(10		)	(10		)	(10		)
Net income available to common stockholders	$	3,464		$	3,021		$	1,745
Denominator:
Weighted-average number of common shares outstanding – Basic	928,417,000			908,860,000			904,395,000
Dilutive effect of the company's employee compensation plans	12,612,000			12,795,000			4,317,000
Weighted average number of common shares outstanding – Diluted	941,029,000			921,655,000			908,712,000

The weighted-average number of common shares outstanding in 2011 and 2010 increased as a result of the issuance of new shares from the company's equity compensation plans, partially offset by the company's repurchase and retirement of its common stock (see Note 16).

The following average number of stock options are antidilutive and therefore, are not included in the diluted earnings per share calculation:

	2011	2010	2009
Average number of stock options	4,361,000	45,508,000	72,899,000

The change in the average number of stock options that were antidilutive in 2011 and 2010 was primarily due to changes in the company's average stock price.