Condensed Consolidated Statements Of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Income Statement [Abstract]
Document Period End Date	Apr. 30, 2013
Revenues:
Net sales	$ 113,429	$ 112,264
Membership and other income	758	746
Total revenues	114,187	113,010
Costs and expenses:
Cost of sales	86,027	85,178
Operating, selling, general and administrative expenses	21,704	21,445
Operating income	6,456	6,387
Interest:
Debt	507	503
Capital leases	67	70
Interest income	(44)	(38)
Interest, net	530	535
Income before income taxes	5,926	5,852
Provision for income taxes	1,981	1,958
Consolidated net income	3,945	3,894
Less consolidated net income attributable to noncontrolling interest	(161)	(152)
Consolidated net income attributable to Walmart	$ 3,784	$ 3,742
Basic net income per common share:
Basic net income per common share attributable to Walmart	$ 1.15	$ 1.10
Diluted net income per common share:
Diluted net income per common share attributable to Walmart	$ 1.14	$ 1.09
Weighted-average common shares outstanding:
Basic	3,301	3,409
Diluted	3,318	3,425
Dividends declared per common share	$ 1.88	$ 1.59