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Business Combinations (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 01, 2018
USD ($)
May 23, 2018
USD ($)
May 23, 2018
CAD ($)
Jan. 02, 2018
USD ($)
Apr. 03, 2017
USD ($)
May 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
pharmacy
Dec. 31, 2016
CAD ($)
pharmacy
Sep. 30, 2017
USD ($)
pharmacy
Sep. 30, 2017
CAD ($)
pharmacy
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
CAD ($)
Business Acquisition [Line Items]                                  
Goodwill                       $ 10,519,000,000       $ 10,924,000,000  
Net purchase consideration                       866,000,000 $ 1,979,000,000        
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 245,000,000                                
Liabilities assumed as of the acquisition date 163,000,000                                
Goodwill 376,000,000                                
Intangible assets $ 326,000,000                                
Weighted average life of intangibles 18 years                                
Rexall Health | CANADA                                  
Business Acquisition [Line Items]                                  
Net purchase consideration               $ 2,100,000,000 $ 2,900                
Number of retail pharmacies | pharmacy               400 400                
Number of Stores Sold | pharmacy                   27 27            
RxCrossroads                                  
Business Acquisition [Line Items]                                  
Assets acquired as of the acquisition date, excluding goodwill and intangibles                       129,000,000          
Liabilities assumed as of the acquisition date                       57,000,000          
Goodwill       $ 386,000,000                          
Intangible assets       $ 262,000,000                          
Weighted average life of intangibles       14 years                          
Net purchase consideration       $ 720,000,000                          
CoverMyMeds, LLC (CMM)                                  
Business Acquisition [Line Items]                                  
Net purchase consideration         $ 1,300,000,000                        
intraFUSION, BDI Pharma, LLC, and Uniprix Group                                  
Business Acquisition [Line Items]                                  
Assets acquired as of the acquisition date, excluding goodwill and intangibles                             $ 292,000,000    
Liabilities assumed as of the acquisition date                             160,000,000    
Goodwill                             246,000,000    
Intangible assets                             $ 118,000,000    
Net purchase consideration             $ 485,000,000                    
Additional amount, Up to | CoverMyMeds, LLC (CMM)                                  
Business Acquisition [Line Items]                                  
Contingent consideration                           $ 160,000,000      
Estimate of Fair Value | CoverMyMeds, LLC (CMM)                                  
Business Acquisition [Line Items]                                  
Contingent consideration         $ 113,000,000             66,000,000       $ 124,000,000  
Payment for contingent consideration liability           $ 68,000,000                      
Third Party Buyer of Rexall Health | Rexall Health | CANADA                                  
Business Acquisition [Line Items]                                  
Net cash proceeds received             $ 94,000,000     $ 94,000,000             $ 116
Third Party Seller of Rexall Health | Rexall Health | CANADA                                  
Business Acquisition [Line Items]                                  
Proceeds from prior acquisitions   $ 97,000,000 $ 125             119,000,000 $ 147 $ 97,000,000          
Gain (loss) recognized on sale of stores                   $ 0