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Business Combinations - Other Acquisition (Details)
$ in Millions, CAD in Billions
3 Months Ended 6 Months Ended
Apr. 01, 2016
USD ($)
cancer_treatment_facility
state
Feb. 29, 2016
USD ($)
Mar. 31, 2016
USD ($)
pharmacy
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Sainsbury | United Kingdom          
Business Acquisition [Line Items]          
Net purchase consideration   $ 174      
Interest rate   0.033      
UDG          
Business Acquisition [Line Items]          
Gross purchase consideration     $ 412    
Vantage | Subsequent Event          
Business Acquisition [Line Items]          
Net purchase consideration $ 527        
Number of cancer treatment facilities (more than) | cancer_treatment_facility 51        
Number of states | state 13        
Biologics | Subsequent Event          
Business Acquisition [Line Items]          
Gross purchase consideration $ 700        
Rexall Health          
Business Acquisition [Line Items]          
Currency exchange ratio, CAD per USD     0.77    
Rexall Health | Scenario, Forecast          
Business Acquisition [Line Items]          
Net purchase consideration       $ 2,300 CAD 3
Rexall Health | Canada          
Business Acquisition [Line Items]          
Number of pharmacies that will be acquired | pharmacy     470