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Acquisitions - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Feb. 23, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 9,763 $ 9,768 $ 7,095
Acquisition-related Costs        
Business Acquisition [Line Items]        
Acquisition costs     74  
Stock Option        
Business Acquisition [Line Items]        
Future expense for converted King unvested options and awards   $ 80    
Weighted average service period of acquired options and awards   1 year 3 months 7 days    
King        
Business Acquisition [Line Items]        
Aggregate purchase price $ 5,800      
Cash paid to acquire business 3,600      
Cash paid to acquire business from debt financing 2,200      
Goodwill 2,675      
Future expense for converted King unvested options and awards     $ 40  
Weighted average service period of acquired options and awards     1 year 7 months 6 days  
Goodwill expected to be deductible for tax purposes $ 620      
King | Stock Option        
Business Acquisition [Line Items]        
Equity options and awards issued in acquisition (in shares) 10      
King | Equity Award        
Business Acquisition [Line Items]        
Equity options and awards issued in acquisition (in shares) 3      
Fair value of King’s existing vested and unvested stock options and awards assumed $ 76      
King | Deferred Cash Award        
Business Acquisition [Line Items]        
Fair value of King’s existing vested and unvested stock options and awards assumed 22      
Future expense for converted King unvested options and awards 9      
King | Long-term debt, net        
Business Acquisition [Line Items]        
Debt discount and issuance costs $ 38      
King | General and administrative        
Business Acquisition [Line Items]        
Acquisition costs     $ 38