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Acquisitions - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
Feb. 23, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 9,762 $ 9,763 $ 9,768
Acquisition-related Costs        
Business Acquisition [Line Items]        
Acquisition costs       74
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      
Goodwill expected to be deductible for tax purposes $ 464      
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      
King | General and administrative        
Business Acquisition [Line Items]        
Acquisition costs       $ 38