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Other (Income)/Deductions - Net - Footnotes - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 08, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Income from resolution of contract disagreement   $ 62 $ 116  
Payments for merger termination costs $ 150   $ 150  
Writedown of assets to net realizable value       $ 194
Income (Loss) from equity method investments       45
ViiV Healthcare Limited [Member]        
Business Acquisition [Line Items]        
Change in fair value of fair value contingent consideration liabilities       $ 159
Operating Segments [Member] | Innovative Health Segment [Member] | ViiV Healthcare Limited [Member]        
Business Acquisition [Line Items]        
Dividend income   $ 266