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Acquisitions, Disposals and Related Items (Details)
3 Months Ended 12 Months Ended
Jun. 04, 2018
USD ($)
May 09, 2018
USD ($)
Apr. 30, 2018
GBP (£)
Apr. 04, 2017
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2018
Business Acquisition [Line Items]              
Payments to acquire businesses, net of cash acquired         $ 0 $ 88,000,000  
Subsequent Event [Member] | Flipkart [Member]              
Business Acquisition [Line Items]              
Payments to acquire businesses, net of cash acquired   $ 16,000,000,000          
Aggregate ownership, percent   77.00%          
Subsequent Event [Member] | Flipkart [Member] | Equity Securities [Member]              
Business Acquisition [Line Items]              
New equity funding   $ 2,000,000,000          
Suburbia [Member]              
Business Acquisition [Line Items]              
Proceeds from divestiture of businesses       $ 1,000,000,000      
Gain (loss) on disposition of business, including deferred portion       700,000,000      
Gain (loss) on disposition of business       400,000,000      
Gain (loss) on disposition of business, deferred portion       $ 300,000,000      
Gain deferral period             20 years
Walmart Brazil [Member] | Subsequent Event [Member]              
Business Acquisition [Line Items]              
Equity method investment, ownership percentage 20.00%            
Gain (loss) on disposition of business $ (4,500,000,000)            
Ownership sold, percent 80.00%            
Contingent consideration $ 250,000,000            
Asda [Member]              
Business Acquisition [Line Items]              
Equity method investment, ownership percentage     42.00%   42.00%    
Proceeds from divestiture of businesses | £     £ 3,000,000,000