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Business Combinations - Acquisition Activity (Details) - USD ($)
$ in Millions
1 Months Ended
May 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill   $ 5,170 $ 4,773
Glosis      
Business Acquisition [Line Items]      
Percent of business acquired 100.00%    
Purchase consideration $ 306    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill 532    
Purchased intangible assets 91    
Net liabilities (50)    
Total $ 573