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Business Acquisitions and Divestitures - Divestitures and Other (Details)
€ in Millions, £ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
Apr. 06, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Apr. 06, 2022
GBP (£)
Jan. 31, 2022
USD ($)
Jan. 31, 2022
EUR (€)
Nov. 01, 2020
USD ($)
Discontinued Operations Disclosures                      
Assets held for sale     $ 17 $ 4,516 $ 17 $ 4,516          
Liabilities held for sale     5 4,741 5 4,741          
European businesses, disposal group, losses (gains)         0 1,509 $ 0        
Accumulated other comprehensive loss adjustment     $ 6                
German Pharmaceutical Wholesale Joint Venture                      
Discontinued Operations Disclosures                      
Carrying value of investment in joint venture             0        
International                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)             58        
Held-for-sale                      
Discontinued Operations Disclosures                      
Assets held for sale       4,500   4,500          
Liabilities held for sale       4,700   4,700          
Held-for-sale | German Pharmaceutical Wholesale Joint Venture                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)             58        
European Businesses (Disposal Group) | Held-for-sale                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)           1,600          
E.U. Businesses (Disposal Group) | Held-for-sale                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)           438          
Divested net assets       3,024   3,024          
Accumulated other comprehensive loss in charge for remeasurement to fair value           151          
E.U. Businesses (Disposal Group) | Held-for-sale | International | Operating Segments                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)         240 383          
E.U. Businesses (Disposal Group) | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)         $ (66)            
Cash proceeds from divestiture $ 892                    
Divested net assets 1,300                    
Divested cash 319                    
Divested carrying value of noncontrolling interest held by minority shareholders 382                    
Accumulated other comprehensive loss adjustment $ 153                    
U.K. Businesses (Disposal Group) | Held-for-sale                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)           1,200          
Divested net assets       1,482   1,482          
Divested cash       531   531          
Accumulated other comprehensive loss in charge for remeasurement to fair value           734          
Gross purchase price   $ 144           £ 110      
U.K. Businesses (Disposal Group) | Held-for-sale | International | Operating Segments                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)           1,100          
U.K. Businesses (Disposal Group) | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Discontinued Operations Disclosures                      
Proceeds from collection of notes receivable   118                  
International | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Aurelius Elephant Limited                      
Discontinued Operations Disclosures                      
Divested net assets   615                  
Accumulated other comprehensive loss adjustment   $ 731                  
Austrian Business Operations | Held-for-sale                      
Discontinued Operations Disclosures                      
European businesses, disposal group, losses (gains)           32          
Proceeds from collection of notes receivable       63              
Consideration agreed upon for sale of business                 $ 276 € 244  
Net assets       $ 272   $ 272          
German Wholesale Business                      
Discontinued Operations Disclosures                      
Proceeds from collection of notes receivable             $ 291        
Consideration receivable                     $ 41
German Wholesale Business | Held-for-sale | International | Walgreens Boots Alliance Joint Venture | Operating Segments                      
Discontinued Operations Disclosures                      
Ownership interest in Joint Venture (percent)                     30.00%