Business Combinations - Acquisition Activity (Details) - USD ($) $ in Millions	1 Months Ended
	May 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 5,199	$ 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]
Purchased intangible assets	91
Goodwill	532
Net liabilities	(50)
Total	$ 573