Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (2,103)	$ (2,046)	$ (2,133)	$ (2,341)	$ (2,376)	$ (2,517)	$ (2,133)	$ (2,517)
Total other comprehensive (loss) income, net of tax	(106)	(52)	39	110	(35)	63	(119)	138
Ending balance	(2,196)	(2,103)	(2,046)	(2,188)	(2,341)	(2,376)	(2,196)	(2,188)
Foreign Exchange Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			153			86	153	86
Other comprehensive income (loss) before reclassifications							(111)	127
Total other comprehensive (loss) income, net of tax							(111)	127
Ending balance	42			213			42	213
Changes in Fair Value of Effective Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			4				4
Other comprehensive income (loss) before reclassifications							(8)	9
Amounts reclassified from accumulated other comprehensive income (loss)								1
Total other comprehensive (loss) income, net of tax							(8)	10
Ending balance	(4)			10			(4)	10
Pension Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(27)			(13)	(27)	(13)
Amounts reclassified from accumulated other comprehensive income (loss)								1
Total other comprehensive (loss) income, net of tax								1
Ending balance	(27)			(12)			(27)	(12)
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	117	169	130	101	136	73	130	73
Other comprehensive income (loss) before reclassifications							(119)	136
Amounts reclassified from accumulated other comprehensive income (loss)								2
Total other comprehensive (loss) income, net of tax	(106)	(52)	39	110	(35)	63	(119)	138
Ending balance	$ 11	$ 117	$ 169	$ 211	$ 101	$ 136	$ 11	$ 211