Summary of Changes to Restructuring-Related Liabilities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Balance, beginning	$ 6	$ 2	$ 4
Restructuring and other related charges	(118)	(80)	(22)
Balance, ending	9	6	2
Americas
Restructuring Cost and Reserve [Line Items]
Balance, beginning	2	0	1
Balance, ending	3	2	0
International
Restructuring Cost and Reserve [Line Items]
Balance, beginning	4	2	3
Balance, ending	6	4	2
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	3	1	4
Balance, ending	4	3	1
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	1	0	0
Balance, ending	2	1	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	2	1	0
Balance, ending	3	2	1
2014 T15 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(1)
Cash payment/utilization			1
2014 T15 Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
2014 T15 Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(1)
Cash payment/utilization			1
2014 T15 Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(1)
Cash payment/utilization			1
2014 T15 Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
2014 T15 Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
T19 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(14)	(55)
Cash payment/utilization	20	51
T19 Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(14)	(39)
Cash payment/utilization	16	38
T19 Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	0	(16)
Cash payment/utilization	4	13
T19 Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	0	(24)
Cash payment/utilization	5	21
T19 Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	0	0
Cash payment/utilization	0	0
T19 Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(14)	(31)
Cash payment/utilization	15	30
Brazil Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	0	(7)
Cash payment/utilization	1	6
Brazil Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges		(7)
Cash payment/utilization	1	6
Brazil Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges		0
Cash payment/utilization	0	0
Brazil Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(1)	(1)
Cash payment/utilization	0	1
Brazil Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(1)	(1)
Cash payment/utilization	1	0
Brazil Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(2)	(5)
Cash payment/utilization	2	5
2018 Truck Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(5)
Cash payment/utilization			5
2018 Truck Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(5)
Cash payment/utilization			5
2018 Truck Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
2018 Truck Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(1)
Cash payment/utilization			1
2018 Truck Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
2018 Truck Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(4)
Cash payment/utilization			4
Workforce Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(13)
Cash payment/utilization		1	12
Workforce Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(4)
Cash payment/utilization		0	4
Workforce Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(9)
Cash payment/utilization		1	8
Workforce Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(11)
Cash payment/utilization		1	11
Workforce Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization		0	0
Workforce Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(2)
Cash payment/utilization		$ 0	1
T17 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(2)
Cash payment/utilization			5
T17 Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(2)
Cash payment/utilization			3
T17 Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			2
T17 Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			3
T17 Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			0
Cash payment/utilization			0
T17 Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges			(2)
Cash payment/utilization			$ 2
2020 Optimization
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(79)
Cash payment/utilization	71
2020 Optimization | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(31)
Cash payment/utilization	29
2020 Optimization | International
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(48)
Cash payment/utilization	42
2020 Optimization | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(73)
Cash payment/utilization	68
2020 Optimization | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(3)
Cash payment/utilization	2
2020 Optimization | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related charges	(3)
Cash payment/utilization	$ 1