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Exit and disposal activities - Narrative (Details)
$ in Millions
1 Months Ended
Oct. 12, 2021
USD ($)
store
Dec. 20, 2018
USD ($)
Jul. 31, 2021
store
Nov. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
Nov. 30, 2020
USD ($)
Aug. 31, 2020
USD ($)
Sep. 01, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]                
Cumulative effect adjustment to decrease retained earnings       $ (30,579) $ (23,822) $ (20,563) $ (21,136)  
Adoption of New Accounting Standards                
Restructuring Cost and Reserve [Line Items]                
Cumulative effect adjustment to decrease retained earnings             5  
Retained Earnings                
Restructuring Cost and Reserve [Line Items]                
Cumulative effect adjustment to decrease retained earnings       (38,286) $ (35,121) $ (33,495) (34,210)  
Retained Earnings | Adoption of New Accounting Standards                
Restructuring Cost and Reserve [Line Items]                
Cumulative effect adjustment to decrease retained earnings             $ 3  
Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       1,500        
Transformational Cost Management Program | United Kingdom                
Restructuring Cost and Reserve [Line Items]                
Number of stores expected to close | store 150   200          
Transformational Cost Management Program | United States                
Restructuring Cost and Reserve [Line Items]                
Number of stores expected to close | store 150   250          
Transformational Cost Management Program | Retained Earnings | Adoption of New Accounting Standards                
Restructuring Cost and Reserve [Line Items]                
Cumulative effect adjustment to decrease retained earnings               $ 508
Lease Obligations and Other Real Estate Costs | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       442        
Asset Impairments | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       292        
Employee Severance and Business Transition Costs | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       550        
Information Technology Transformation and Other Exit Costs | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       172        
Minimum | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Expected annual cost savings of restructuring plan $ 3,300 $ 2,000            
Expected cost       3,600        
Minimum | Exit and Disposal Costs | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Expected cost       3,300        
Maximum | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Expected cost       3,900        
Maximum | Exit and Disposal Costs | Transformational Cost Management Program                
Restructuring Cost and Reserve [Line Items]                
Expected cost       $ 3,600