Taxes (Schedule of Income from Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Taxes [Line Items]
Income from continuing operations before income taxes	$ 24,656	$ 25,662	$ 24,332
Us Domestic [Member]
Taxes [Line Items]
Income from continuing operations before income taxes	19,412	19,352	18,685
Walmart International
Taxes [Line Items]
Income from continuing operations before income taxes	$ 5,244	$ 6,310	$ 5,647

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration