Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Calculations of earnings per share under the 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,
	2011		2010		2011		2010
Basic Earnings per Common Share
Net income attributable to Merck & Co., Inc.	$	1,692	$	342	$	4,760	$	1,393
Less: Income allocated to participating securities		3		2		12		6
Net income allocated to common shareholders	$	1,689	$	340	$	4,748	$	1,387
Average common shares outstanding		3,070		3,078		3,079		3,099
	$	0.55	$	0.11	$	1.54	$	0.45
Earnings per Common Share Assuming Dilution
Net income attributable to Merck & Co., Inc.	$	1,692	$	342	$	4,760	$	1,393
Less: Income allocated to participating securities		3		2		12		6
Net income allocated to common shareholders	$	1,689	$	340	$	4,748	$	1,387
Average common shares outstanding		3,070		3,078		3,079		3,099
Common shares issuable (1)		21		24		23		24
Average common shares outstanding assuming dilution		3,091		3,102		3,102		3,123
	$	0.55	$	0.11	$	1.53	$	0.44

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