Revenue - Disaggregated Revenue by Categories (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 692	$ 595	$ 2,066	$ 1,674
North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	332		1,014
North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	12		76
Defense
Disaggregation of Revenue [Line Items]
Total Net Sales	42		122
Outside North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	96		288
Outside North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	46		82
Service Parts, Support Equipment and Other
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 164		$ 484