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Acquisitions and other investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 24, 2021
Oct. 29, 2021
Feb. 28, 2022
Nov. 30, 2021
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Nov. 23, 2021
Oct. 28, 2021
Business Acquisition [Line Items]                  
Gain on sale of equity method investment           $ 0 $ 191    
VillageMD                  
Business Acquisition [Line Items]                  
Outstanding equity interest percentage 63.00%             30.00%  
Purchase price $ 5,200                
Cash consideration, gross 4,000                
Promissory note 1,200                
Cash paid to existing stockholders 2,900                
Value of purchase tender offer 1,900                
Cash consideration for preferred units $ 1,100                
Gain on sale of equity method investment     $ 1,597            
Pre-tax gain related to conversion of previously held investment in convertible debt securities     577            
Shields Health Solutions Parent, LLC                  
Business Acquisition [Line Items]                  
Outstanding equity interest percentage   70.00%             25.00%
Gain on sale of equity method investment       $ 402          
Cash consideration, subject to purchase price adjustments   $ 969              
Other Acquisitions                  
Business Acquisition [Line Items]                  
Cash consideration, net     $ 42   $ 28 $ 116 $ 66