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Other (Income)/Deductions - Net - Footnotes - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 21, 2016
Apr. 08, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Payments for merger termination costs   $ 150 $ 150    
Income from resolution of contract disagreement     116    
Loss on early redemption of debt $ 312   $ 312    
Writedown of assets to net realizable value       $ 194  
Income (Loss) from equity method investments       45 $ 86
ViiV Healthcare Limited [Member]          
Business Acquisition [Line Items]          
Change in fair value of fair value contingent consideration liabilities       $ 159 (40)
ViiV Healthcare Limited [Member] | Other Nonoperating Income (Expense) [Member]          
Business Acquisition [Line Items]          
Loss on change of interest in investment         30
Laboratorio Teuto Brasilero [Member] | Other Nonoperating Income (Expense) [Member]          
Business Acquisition [Line Items]          
Equity method investment, recognized gain (loss)         $ 55