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Acquisitions (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 29, 2017
USD ($)
category
country
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]          
Cash paid for acquisitions, net of cash acquired       $ 6,141 $ 11
Goodwill   $ 7,221 $ 10,045 10,045  
Goodwill, Acquired During Period       3,188  
Patient Recovery Business          
Business Acquisition [Line Items]          
Cash paid for acquisitions, net of cash acquired $ 6,100        
Number of Product Categories Manufactured | category 23        
Number of principal countries | country 28        
Proceeds from Issuance of Debt   $ 4,500      
Transaction and integration costs     24 61  
Goodwill     $ 3,137 $ 3,137  
Fair Value, Inputs, Level 3 | Patient Recovery Business          
Business Acquisition [Line Items]          
Fair Value Inputs, Discount Rate 8.20%