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Share Repurchases (Narrative) (Details) (2013 Share repurchase program, USD $)
In Billions, unless otherwise specified
Apr. 30, 2015
Jun. 06, 2013
2013 Share repurchase program
    
Equity, Class of Treasury Stock [Line Items]    
Share repurchase program, authorized amount   $ 15.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= wmt_TwoThousandAndThirteenShareRepurchaseProgramMember
Stock repurchase program, remaining authorized repurchase amount $ 10.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= wmt_TwoThousandAndThirteenShareRepurchaseProgramMember