Accumulated Other Comprehensive Loss and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 796	$ 234	$ 430	$ (79)	$ (20)	$ 703	$ 430	$ 703
Other comprehensive (loss) income before reclassifications							(197)	(75)
Reclassification adjustments							0	(10)
Total other comprehensive (loss) income, net of tax	(138)	96	(155)	162	131	(378)	(197)	(85)
Balance at end of period	918	796	234	229	(79)	(20)	918	229
Intra-entity foreign currency long-term-investment gains (losses)							30	(21)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(139)			(368)	(139)	(368)
Other comprehensive (loss) income before reclassifications							(197)	(87)
Reclassification adjustments							0	0
Total other comprehensive (loss) income, net of tax							(197)	(87)
Balance at end of period	(336)			(455)			(336)	(455)
Derivative Instrument and Other Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			4			7	4	7
Other comprehensive (loss) income before reclassifications							0	12
Reclassification adjustments							0	(10)
Total other comprehensive (loss) income, net of tax							0	2
Balance at end of period	4			9			4	9
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(194)	(290)	(135)	(608)	(739)	(361)	(135)	(361)
Total other comprehensive (loss) income, net of tax	(138)	96	(155)	162	131	(378)
Balance at end of period	$ (332)	$ (194)	$ (290)	$ (446)	$ (608)	$ (739)	$ (332)	$ (446)