Revenue - Disaggregated Revenue by Categories (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 669	$ 692	$ 2,081	$ 2,066
North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	369	332	1,144	1,014
North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	6	12	29	76
Defense
Disaggregation of Revenue [Line Items]
Total Net Sales	40	42	109	122
Outside North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	99	96	299	288
Outside North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	24	46	91	82
Service Parts, Support Equipment and Other
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 131	$ 164	$ 409	$ 484