Restructuring - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 22	$ 71
Restructuring Costs, Net	21	27	$ 87
Payments	(27)	(60)
Reclassifications		(14)
Foreign Currency and Other	(5)	(2)
Ending balance	11	22	71
Non-cash restructuring charges		1
Severance and termination costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	10	24
Restructuring Costs, Net	15	20
Payments	(18)	(33)
Reclassifications		0
Foreign Currency and Other	0	(1)
Ending balance	7	10	24
Contract termination and other costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	12	47
Restructuring Costs, Net	6	7
Payments	(9)	(27)
Reclassifications		(14)
Foreign Currency and Other	(5)	(1)
Ending balance	$ 4	$ 12	$ 47