Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 2,603	$ 2,874	$ 2,719
Other comprehensive income (loss) before reclassifications	(88)	67
Amounts reclassified from accumulated other comprehensive (loss)	4	2
Total other comprehensive income (loss), net of tax	(84)	69	(46)
Pension transfers	(5)
Ending Balance	1,533	2,603	2,874
Foreign Exchange Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(100)	(170)
Other comprehensive income (loss) before reclassifications	(77)	70
Total other comprehensive income (loss), net of tax	(77)	70
Ending Balance	(177)	(100)	(170)
Pension Adjusments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss) before reclassifications	(7)
Total other comprehensive income (loss), net of tax	(7)
Pension transfers	(5)
Ending Balance	(12)
Changes in Fair Value of Effective Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		1
Other comprehensive income (loss) before reclassifications	(4)	(3)
Amounts reclassified from accumulated other comprehensive (loss)	4	2
Total other comprehensive income (loss), net of tax		(1)
Ending Balance			1
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(100)	(169)	(123)
Ending Balance	$ (189)	$ (100)	$ (169)