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Acquisitions and other investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 03, 2023
Dec. 28, 2022
Oct. 11, 2022
Aug. 31, 2022
Nov. 24, 2021
Oct. 29, 2021
Feb. 28, 2023
Nov. 30, 2022
Feb. 28, 2022
Nov. 30, 2021
Feb. 28, 2023
Feb. 28, 2022
Nov. 23, 2021
Oct. 28, 2021
Business Acquisition [Line Items]                            
Gain on sale of equity method investments                     $ 1,512 $ 0    
Goodwill, purchase adjustments                     252      
VillageMD                            
Business Acquisition [Line Items]                            
Fair value of equity consideration $ 1,750                          
Noncontrolling interest, ownership percentage by parent 53.00%                          
Debt instrument, fee amount, credit $ 220                          
VillageMD | Line of Credit                            
Business Acquisition [Line Items]                            
Face amount 2,250                          
VillageMD | Line of Credit | Term Loan                            
Business Acquisition [Line Items]                            
Face amount 1,750                          
VillageMD | Line of Credit | Credit facilities                            
Business Acquisition [Line Items]                            
Face amount 500                          
VillageMD | Cigna                            
Business Acquisition [Line Items]                            
Fair value of equity consideration 2,500                          
VillageMD                            
Business Acquisition [Line Items]                            
Purchase price         $ 5,200                  
Fair value of equity consideration         683                  
Intangible assets         $ 1,621                  
Outstanding equity interest percentage         63.00%               30.00%  
Cash consideration, gross         $ 4,000                  
Promissory note         1,200                  
Business combination, consideration transferred to existing stockholders         2,900                  
Value of purchase tender offer         1,900                  
Cash consideration for preferred units         1,100                  
Gain related to fair value of company's previously held minority equity interest                   $ 1,597        
Pre-tax gain related to conversion of previously held investment in convertible debt securities                   577        
Gain on sale of equity method investments                   2,200        
Goodwill, purchase adjustments               $ 125            
VillageMD | Provider networks                            
Business Acquisition [Line Items]                            
Intangible assets         $ 1,200                  
Useful life of intangible assets         15 years                  
VillageMD | Trade Names                            
Business Acquisition [Line Items]                            
Intangible assets         $ 295                  
Useful life of intangible assets         13 years                  
VillageMD | Technology-Based Intangible Assets                            
Business Acquisition [Line Items]                            
Intangible assets         $ 76                  
Useful life of intangible assets         5 years                  
Shields Health Solutions Parent, LLC                            
Business Acquisition [Line Items]                            
Cash consideration, subject to purchase price adjustments           $ 969                
Fair value of equity consideration           13                
Intangible assets           $ 1,060                
Outstanding equity interest percentage   30.00%       70.00%               25.00%
Cash consideration, gross   $ 1,400                        
Gain on sale of equity method investments                   $ 402        
Goodwill, purchase adjustments               $ 72            
Shields Health Solutions Parent, LLC | Trade Names                            
Business Acquisition [Line Items]                            
Intangible assets           $ 47                
Useful life of intangible assets           13 years                
Shields Health Solutions Parent, LLC | Technology-Based Intangible Assets                            
Business Acquisition [Line Items]                            
Intangible assets           $ 117                
Useful life of intangible assets           5 years                
Shields Health Solutions Parent, LLC | Customer Relationships                            
Business Acquisition [Line Items]                            
Intangible assets           $ 896                
Useful life of intangible assets           13 years                
CareCentrix, Inc                            
Business Acquisition [Line Items]                            
Cash consideration, subject to purchase price adjustments       $ 327                    
Purchase price     $ 392                      
Fair value of equity consideration       66                    
Business combination, consideration transferred, employees       12                    
Intangible assets       $ 426                    
Outstanding equity interest percentage     45.00% 55.00%                    
Cash consideration, gross       $ 339                    
Goodwill, purchase adjustments             $ (6)       56      
CareCentrix, Inc | Trade Names                            
Business Acquisition [Line Items]                            
Intangible assets       $ 93                    
Useful life of intangible assets       13 years                    
CareCentrix, Inc | Technology-Based Intangible Assets                            
Business Acquisition [Line Items]                            
Intangible assets       $ 86                    
Useful life of intangible assets       5 years                    
CareCentrix, Inc | Customer Relationships                            
Business Acquisition [Line Items]                            
Intangible assets       $ 247                    
Useful life of intangible assets       13 years                    
Other Acquisitions                            
Business Acquisition [Line Items]                            
Cash consideration, net             $ 35   $ 42   $ 90 $ 116    
Summit Health-CityMD                            
Business Acquisition [Line Items]                            
Cash consideration, subject to purchase price adjustments 7,000                          
Purchase price 4,850                          
Fair value of equity consideration 1,980                          
Deferred consideration 100                          
Business combination, consideration transferred, employees 86                          
Summit debt paid at closing 1,900                          
Intangible assets 3,359                          
Summit Health-CityMD | Preferred Partnership Interest                            
Business Acquisition [Line Items]                            
Fair value of equity consideration 2,050                          
Summit Health-CityMD | Provider networks                            
Business Acquisition [Line Items]                            
Intangible assets $ 1,900                          
Useful life of intangible assets 16 years                          
Summit Health-CityMD | Trade Names                            
Business Acquisition [Line Items]                            
Intangible assets $ 1,500                          
Summit Health-CityMD | Minimum | Trade Names                            
Business Acquisition [Line Items]                            
Useful life of intangible assets 11 years                          
Summit Health-CityMD | Maximum | Trade Names                            
Business Acquisition [Line Items]                            
Useful life of intangible assets 15 years