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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 17, 2019
USD ($)
warehouse
states
Feb. 18, 2018
USD ($)
Feb. 17, 2019
USD ($)
warehouse
states
Feb. 18, 2018
USD ($)
Sep. 02, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 769   769    
Number of states in country | states 44   44    
Total Revenue $ 35,396 $ 32,995 $ 70,465 $ 64,804  
Reduction In Sales 364 329 714 646  
Revenue Recognition, Sales Returns, Reserve for Sales Returns 731   731   $ 649
Merchandise costs 30,720 28,733 61,343 56,350  
Gross Margin (1) 3,908   7,596    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets 16   16    
Membership fees          
Summary Of Significant Accounting Policies [Line Items]          
Total Revenue 768 716 1,526 1,408  
Deferred Revenue, Current     1,144    
Net Sales          
Summary Of Significant Accounting Policies [Line Items]          
Total Revenue 34,628 $ 32,279 68,939 $ 63,396  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Merchandise costs 183   514    
Gross Margin (1) (4)   5    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Net Sales          
Summary Of Significant Accounting Policies [Line Items]          
Total Revenue 179   519    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Merchandise costs 30,537   60,829    
Gross Margin (1) 3,912   7,591    
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Net Sales          
Summary Of Significant Accounting Policies [Line Items]          
Total Revenue $ 34,449   $ 68,420    
UNITED STATES          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 534   534    
CANADA          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 100   100    
MEXICO          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 39   39    
UNITED KINGDOM          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 28   28    
JAPAN          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 26   26    
KOREA          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 15   15    
TAIWAN          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 13   13    
AUSTRALIA          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 10   10    
SPAIN          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 2   2    
ICELAND          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 1   1    
FRANCE          
Summary Of Significant Accounting Policies [Line Items]          
Number of warehouses operated | warehouse 1   1