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Segment Net Sales (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Segment Reporting Information [Line Items]    
Net sales $ 114,002us-gaap_SalesRevenueNet $ 114,167us-gaap_SalesRevenueNet
Walmart U.S.    
Segment Reporting Information [Line Items]    
Net sales 70,245us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_WalmartUSMember		 67,852us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_WalmartUSMember
Walmart International    
Segment Reporting Information [Line Items]    
Net sales 30,278us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_WalmartInternationalMember		 32,424us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_WalmartInternationalMember
Sam's Club    
Segment Reporting Information [Line Items]    
Net sales $ 13,479us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_SamsClubMember		 $ 13,891us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= wmt_SamsClubMember