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Held for Sale - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Nov. 01, 2020
Discontinued Operations Disclosures          
Assets held for sale   $ 906 $ 12 $ 906  
Liabilities held for sale   683 9 683  
German Pharmaceutical Wholesale Joint Venture | Corporate Joint Venture          
Discontinued Operations Disclosures          
Carrying value of investment in joint venture     0    
Walgreens Boots Alliance Joint Venture          
Discontinued Operations Disclosures          
Noncontrolling interest (percent)         30.00%
Held-for-sale          
Discontinued Operations Disclosures          
Assets held for sale   906 12 906  
Liabilities held for sale   683 9 683  
German Wholesale Business          
Discontinued Operations Disclosures          
Consideration receivable         $ 41
Notes payable assumed $ 291        
German Wholesale Business | Held-for-sale          
Discontinued Operations Disclosures          
Assets held for sale   842   842  
Liabilities held for sale   656   656  
Assets held for sale         0
Liabilities held for sale         $ 0
Cumulative foreign currency translation adjustment   $ 3      
German Wholesale Business | International          
Discontinued Operations Disclosures          
Pre-tax loss on sale of business     58 275  
After-tax loss on sale of business     $ 58 $ 275