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Acquisitions, Disposals, and Related Items Acquisitions, Disposals, and Related Items (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 01, 2015
May. 12, 2014
Feb. 01, 2014
Oct. 31, 2015
Oct. 31, 2014
Significant Acquisitions and Disposals [Line Items]          
Proceeds from the disposal of certain operations       $ 246 $ 671
Walmart Chile          
Significant Acquisitions and Disposals [Line Items]          
Purchase of interests of noncontrolling interest     $ 1,500    
Sale of stock, percentage of ownership after transaction     99.70%    
Yihaodian          
Significant Acquisitions and Disposals [Line Items]          
Purchase of interests of noncontrolling interest $ 760        
Vips restaurant business          
Significant Acquisitions and Disposals [Line Items]          
Proceeds from the disposal of certain operations   $ 671      
Net gain on disposition of business   $ 262