Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent			$ 6,310
Net current period other comprehensive income (loss)	$ (346)	$ 78	(482)	$ (222)
Stockholders' Equity Attributable to Parent	21,426		21,426
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent			(285)	(373)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			(493)	(226)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			0	0
Net current period other comprehensive income (loss)			(493)	(226)
Stockholders' Equity Attributable to Parent	(778)	(599)	(778)	(599)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent			(7)	2
OCI, before Reclassifications, Net of Tax, Attributable to Parent			2	(2)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			(5)	4
Net current period other comprehensive income (loss)			7	(6)
Stockholders' Equity Attributable to Parent	0	(4)	0	(4)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent			(406)	(346)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			0	0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			(4)	(10)
Net current period other comprehensive income (loss)			4	10
Stockholders' Equity Attributable to Parent	(402)	(336)	(402)	(336)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent			(698)	(717)
OCI, before Reclassifications, Net of Tax, Attributable to Parent			(491)	(228)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			(9)	(6)
Net current period other comprehensive income (loss)			(482)	(222)
Stockholders' Equity Attributable to Parent	$ (1,180)	$ (939)	$ (1,180)	$ (939)