Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Calculations of Earnings Per Share Under Two-Class Method

The calculations of earnings per share under the two-class method are as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
($ and shares in millions except per share amounts)	2012		2011		2012		2011
Basic Earnings per Common Share
Net income attributable to Merck & Co., Inc.	$	1,729	$	1,692	$	5,261	$	4,760
Less: Income allocated to participating securities		-		3		4		12
Net income allocated to common shareholders	$	1,729	$	1,689	$	5,257	$	4,748
Average common shares outstanding		3,045		3,070		3,043		3,079
	$	0.57	$	0.55	$	1.73	$	1.54
Earnings per Common Share Assuming Dilution
Net income attributable to Merck & Co., Inc.	$	1,729	$	1,692	$	5,261	$	4,760
Less: Income allocated to participating securities		-		3		4		12
Net income allocated to common shareholders	$	1,729	$	1,689	$	5,257	$	4,748
Average common shares outstanding		3,045		3,070		3,043		3,079
Common shares issuable (1)		34		21		34		23
Average common shares outstanding assuming dilution		3,079		3,091		3,077		3,102
	$	0.56	$	0.55	$	1.71	$	1.53

⁽¹⁾  Issuable primarily under share-based compensation plans.