Net Income Per Common Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended				6 Months Ended
	Jul. 31, 2011		Jul. 31, 2010		Jul. 31, 2011		Jul. 31, 2010
Net Income Per Common Share
Antidilutive stock options and share-based awards excluded from computation of diluted net income per common share					4		19
Income from continuing operations	$ 3,937		$ 3,747		$ 7,515		$ 7,191
Less consolidated net income attributable to noncontrolling interest	(136)	[1]	(151)	[1]	(287)	[2]	(294)	[2]
Income from continuing operations attributable to Walmart	$ 3,801		$ 3,596		$ 7,228		$ 6,897
Weighted-average common shares outstanding, basic	3,472		3,696		3,486		3,730
Dilutive impact of stock-based awards	13		11		15		14
Weighted-average common shares outstanding, diluted	3,485		3,707		3,501		3,744
Basic	$ 1.09		$ 0.97		$ 2.07		$ 1.85
Diluted	$ 1.09		$ 0.97		$ 2.06		$ 1.84

[1] Includes $12 million and $5 million for the three months ended July 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.

[2] Includes $29 million and $2 million for the six months ended July 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.