Accrued Liabilities - Summary of Expenses Related to the Repositioning Accruals (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	$ 4	$ 15
Charges	6	3
Usage—cash	(4)	(8)
Adjustments and reclassifications		(5)
Balance at end of period	6	5
Severance Costs
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	3	13
Charges	6	3
Usage—cash	(4)	(6)
Adjustments and reclassifications		(6)
Balance at end of period	5	4
Exit Costs
Restructuring Cost And Reserve [Line Items]
Balance at beginning of period	1	2
Usage—cash	0	(2)
Adjustments and reclassifications		1
Balance at end of period	$ 1	$ 1