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Shareholder's Equity Shareholder's Equity (Schedule of share-based compensation expense) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 462us-gaap_AllocatedShareBasedCompensationExpense $ 388us-gaap_AllocatedShareBasedCompensationExpense $ 378us-gaap_AllocatedShareBasedCompensationExpense
Restricted stock and performance share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 157us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= wmt_RestrictedStockAndPerformanceShareAwardsMember		 141us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= wmt_RestrictedStockAndPerformanceShareAwardsMember		 152us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= wmt_RestrictedStockAndPerformanceShareAwardsMember
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 277us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 224us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 195us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Other      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 28us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		 $ 23us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		 $ 31us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember