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Business Combinations (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Jun. 01, 2018
USD ($)
May 23, 2018
USD ($)
May 23, 2018
CAD ($)
Jan. 02, 2018
USD ($)
Apr. 03, 2017
USD ($)
May 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
pharmacy
Dec. 31, 2016
CAD ($)
pharmacy
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Business Acquisition [Line Items]                          
Goodwill             $ 10,585           $ 10,924
Net purchase consideration             826   $ 1,485        
Medical Specialties Distributors LLC (“MSD”)                          
Business Acquisition [Line Items]                          
Consideration transferred to acquire business $ 784                        
Assets acquired as of the acquisition date, excluding goodwill and intangibles 245                        
Liabilities assumed as of the acquisition date 172                        
Goodwill 360                        
Intangible assets $ 351                        
Weighted average life of intangibles 18 years                        
Rexall Health | CANADA                          
Business Acquisition [Line Items]                          
Number of retail pharmacies | pharmacy                   450 450    
Net purchase consideration                   $ 2,100 $ 2,900    
RxCrossroads                          
Business Acquisition [Line Items]                          
Assets acquired as of the acquisition date, excluding goodwill and intangibles       $ 128                  
Liabilities assumed as of the acquisition date       42                  
Goodwill       372                  
Intangible assets       $ 262                  
Weighted average life of intangibles       14 years                  
Net purchase consideration       $ 720                  
CoverMyMeds, LLC (CMM)                          
Business Acquisition [Line Items]                          
Net purchase consideration         $ 1,300                
intraFUSION, BDI Pharma, LLC, and Uniprix Group                          
Business Acquisition [Line Items]                          
Assets acquired as of the acquisition date, excluding goodwill and intangibles               $ 292          
Liabilities assumed as of the acquisition date               160          
Goodwill               246          
Intangible assets               118          
Net purchase consideration               $ 485          
Additional amount, Up to | CoverMyMeds, LLC (CMM)                          
Business Acquisition [Line Items]                          
Contingent consideration                       $ 160  
Estimate of Fair Value | CoverMyMeds, LLC (CMM)                          
Business Acquisition [Line Items]                          
Contingent consideration         $ 113   $ 54           $ 124
Payment for contingent consideration liability           $ 68              
Third Party Seller of Rexall Health | Rexall Health | CANADA                          
Business Acquisition [Line Items]                          
Proceeds from prior acquisitions   $ 97 $ 125