Accrued Liabilities - Summary of Expenses Related to the Repositioning Accruals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	$ 60	$ 43
Charges	2	20
Usage—cash	(47)	(8)
Foreign currency translation		5
Balance at end of period	15	60
Severance Costs
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	53	35
Charges	2	20
Usage—cash	(42)	(6)
Foreign currency translation		4
Balance at end of period	13	53
Exit Costs
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	7	8
Usage—cash	(5)	(2)
Foreign currency translation		1
Balance at end of period	$ 2	$ 7