Segment Net Sales (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 116,526	$ 114,986
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	75,436	73,295
Walmart International
Segment Reporting Information [Line Items]
Net sales	27,097	28,083
Sam's Club
Segment Reporting Information [Line Items]
Net sales	$ 13,993	$ 13,608

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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