Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ (3,858)	$ (3,921)	$ (3,778)
Foreign currency translation	28	(63)	105
Goodwill acquired during period	14
Divestiture			(6)
Ending Balance, Goodwill	$ (3,900)	$ (3,858)	(3,921)
MT Business
Goodwill [Roll Forward]
Goodwill acquired during period			33
Other
Goodwill [Roll Forward]
Goodwill acquired during period			11
Restatement Adjustment
Goodwill [Roll Forward]
Beginning Balance, Goodwill			$ 9