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Business Combinations (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 01, 2018
USD ($)
May 23, 2018
USD ($)
May 23, 2018
CAD ($)
Apr. 03, 2017
USD ($)
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2016
USD ($)
pharmacy
Dec. 31, 2016
CAD ($)
pharmacy
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]                        
Goodwill                   $ 9,408,000,000   $ 9,358,000,000
Net purchase consideration                   95,000,000 $ 840,000,000  
Medical Specialties Distributors LLC (“MSD”)                        
Business Acquisition [Line Items]                        
Consideration transferred to acquire business $ 784,000,000                      
Assets acquired as of the acquisition date, excluding goodwill and intangibles             $ 239,000,000          
Liabilities assumed as of the acquisition date             169,000,000          
Goodwill             388,000,000          
Intangible assets             $ 326,000,000          
Weighted average life of intangibles             18 years          
CoverMyMeds, LLC (CMM)                        
Business Acquisition [Line Items]                        
Net purchase consideration       $ 1,300,000,000                
Rexall Health | Canada                        
Business Acquisition [Line Items]                        
Net purchase consideration               $ 2,100,000,000 $ 2,900      
Number of retail pharmacies | pharmacy               400 400      
Estimate of Fair Value | CoverMyMeds, LLC (CMM)                        
Business Acquisition [Line Items]                        
Contingent consideration                   $ 0   $ 69,000,000
Payment for contingent consideration liability         $ 69,000,000 $ 68,000,000            
Third Party Seller of Rexall Health | Rexall Health | Canada                        
Business Acquisition [Line Items]                        
Proceeds from prior acquisitions   $ 97,000,000 $ 125               $ 97,000,000