Changes in Accumulated Other Comprehensive Income (Details) - Summary of Changes in Accumulated Other Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (18)	$ 6	$ (18)	$ (8)
Beginning Balance Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, After Tax	(1)	1	(1)	1
Beginning Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(17)	5	(17)	(9)
Other comprehensive income before reclassifications, net of tax	(8)	(16)	(8)	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	0	0	0	0
Foreign currency translation adjustments	(8)	(16)	(8)	(2)
Ending Balance Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, After Tax	(1)	1	(1)	1
Ending Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(25)	(11)	(25)	(11)
Ending Balance	$ (26)	$ (10)	$ (26)	$ (10)