Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2011		Oct. 31, 2010		Oct. 31, 2011		Oct. 31, 2010
Condensed Consolidated Statements Of Comprehensive Income (Unaudited) [Abstract]
Consolidated net income	$ 3,493	[1]	$ 3,590	[1]	$ 10,980	[2]	$ 10,781	[2]
Other comprehensive income
Currency translation	(3,546)	[3]	1,417	[3]	(2,646)	[4]	473	[4]
Net change in fair value of derivatives	15		(81)		(98)		(106)
Total comprehensive income	(38)		4,926		8,236		11,148
Less amounts attributable to the noncontrolling interest:
Consolidated net income	(157)	[1]	(154)	[1]	(444)	[2]	(448)	[2]
Currency translation	870	[3]	(132)	[3]	723	[4]	(192)	[4]
Amounts attributable to the noncontrolling interest	713		(286)		279		(640)
Comprehensive income attributable to Walmart	$ 675		$ 4,640		$ 8,515		$ 10,508

[1] Includes $11 million and $4 million for the three months ended October 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.

[2] Includes $40 million and $6 million for the nine months ended October 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.

[3] Includes $(64) million and $42 million for the three months ended October 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.

[4] Includes $(60) million and $71 million for the nine months ended October 31, 2011 and 2010, respectively, related to the redeemable noncontrolling interest.