Revenue - Disaggregated Revenue by Categories (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 377	$ 737	$ 1,014	$ 1,412
North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	164	398	516	775
North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	3	9	11	23
Defense
Disaggregation of Revenue [Line Items]
Total Net Sales	42	37	82	69
Outside North America On-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	60	106	132	200
Outside North America Off-Highway
Disaggregation of Revenue [Line Items]
Total Net Sales	19	40	46	67
Service Parts, Support Equipment and Other
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 89	$ 147	$ 227	$ 278