Goodwill - Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Millions		3 Months Ended
	Sep. 30, 2019	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 493
Accumulated impairment losses	(15)
Goodwill [Roll Forward]
Goodwill net, Beginning balance		$ 478
AxleTech measurement period adjustment (see Note 10)		2
Foreign currency translation		6
Goodwill net, Ending balance	478	486
Commercial Truck
Goodwill [Line Items]
Goodwill	261
Accumulated impairment losses	0
Goodwill [Roll Forward]
Goodwill net, Beginning balance		261
AxleTech measurement period adjustment (see Note 10)		0
Foreign currency translation		4
Goodwill net, Ending balance	261	265
Aftermarket, Industrial and Trailer
Goodwill [Line Items]
Goodwill	232
Accumulated impairment losses	(15)
Goodwill [Roll Forward]
Goodwill net, Beginning balance		217
AxleTech measurement period adjustment (see Note 10)		2
Foreign currency translation		2
Goodwill net, Ending balance	$ 217	$ 221