Accumulated Other Comprehensive Loss and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 430	$ 703
Other comprehensive (loss) income before reclassifications	(155)	(370)
Reclassification adjustments	0	(8)
Total other comprehensive loss, net of tax	(155)	(378)
Balance at end of period	234	(20)
Intra-entity foreign currency long-term-investment gains	27	11
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(139)	(368)
Other comprehensive (loss) income before reclassifications	(155)	(383)
Reclassification adjustments	0	0
Total other comprehensive loss, net of tax	(155)	(383)
Balance at end of period	(294)	(751)
Derivative Instrument and Other Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	4	7
Other comprehensive (loss) income before reclassifications	0	13
Reclassification adjustments	0	(8)
Total other comprehensive loss, net of tax	0	5
Balance at end of period	4	12
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(135)	(361)
Total other comprehensive loss, net of tax	(155)	(378)
Balance at end of period	$ (290)	$ (739)