Restructuring - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Employee	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 118	$ 80	$ 22
Charges related to voluntary termination program, Number of Positions Eliminated | Employee	400
T19 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 14	55
Payments for Restructuring	(20)	(51)
Brazil Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	7
Restructuring and Related Cost, Number of Positions Eliminated | Employee	22
Payments for Restructuring	$ (1)	$ (6)
Restructuring and Related Cost, Expected Cost Remaining	2
2020 Optimization
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 79
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee	4,300
Payments for Restructuring	$ (71)