Restructuring Costs (Details Textuals) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 30, 2015 USD ($) position	Mar. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($) position	Sep. 30, 2014 USD ($) position	Jun. 30, 2015 USD ($) position
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated	40
M2016 Strategy
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $	$ 2				$ 2
Expected restructuring cost | $	3				3
South America Labor Reduction I
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $				$ 7
Closure Of Corporate Engineering Facility
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated		30
Employee Termination Benefits | Closure Of Corporate Engineering Facility
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $		$ 1
Contract Termination | Closure Of Corporate Engineering Facility
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost | $	2				2
Commercial Truck & Industrial | European Labor Reduction
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $		$ 2
Commercial Truck & Industrial | Employee Termination Benefits | M2016 Strategy
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $			$ 3
Commercial Truck & Industrial | Employee Termination Benefits | South America Labor Reduction II
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring costs | $	6				6
Expected restructuring cost | $	$ 9				$ 9
Hourly Positions | Commercial Truck & Industrial | M2016 Strategy
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated			50
Hourly Positions | Commercial Truck & Industrial | European Labor Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated		20
Hourly Positions | Commercial Truck & Industrial | Employee Termination Benefits | South America Labor Reduction I
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated				190
Hourly Positions | Commercial Truck & Industrial | Employee Termination Benefits | South America Labor Reduction II
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated					230
Salaried Position | Commercial Truck & Industrial | M2016 Strategy
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated			20
Salaried Position | Commercial Truck & Industrial | European Labor Reduction
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated		20
Salaried Position | Commercial Truck & Industrial | Employee Termination Benefits | South America Labor Reduction I
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated				20
Salaried Position | Commercial Truck & Industrial | Employee Termination Benefits | South America Labor Reduction II
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated					20