Accumulated Other Comprehensive Loss and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 234	$ 430	$ (20)	$ 703	$ 430	$ 703
Other comprehensive (loss) income before reclassifications					(59)	(238)
Reclassification adjustments					0	(9)
Total other comprehensive income (loss), net of tax	96	(155)	131	(378)	(59)	(247)
Balance at end of period	796	234	(79)	(20)	796	(79)
Intra-entity foreign currency long-term-investment gains					18	2
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					(59)	(250)
Reclassification adjustments					0	0
Total other comprehensive income (loss), net of tax					(59)	(250)
Balance at end of period	(198)		(618)		(198)	(618)
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	(9)
Total other comprehensive income (loss), net of tax					0	3
Balance at end of period	4		10		4	10
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(290)	(135)	(739)	(361)	(135)	(361)
Total other comprehensive income (loss), net of tax	96	(155)	131	(378)
Balance at end of period	$ (194)	$ (290)	$ (608)	$ (739)	$ (194)	$ (608)