RESTRUCTURING COSTS (Details 1) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1	$ 9	$ 3	$ 3	$ 7	$ 2	$ 1	$ 16	$ 10	$ 23
Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								14	8	17
Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0	1	3
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								2	1	3
South America labor reduction II
Restructuring Cost and Reserve [Line Items]
Restructuring costs								6
South America labor reduction II | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								6
South America labor reduction II | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
South America labor reduction II | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
M2016 footprint actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs								5		2
M2016 footprint actions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								5		2
M2016 footprint actions | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0		0
M2016 footprint actions | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0		0
Closure of engineering facility
Restructuring Cost and Reserve [Line Items]
Restructuring costs								2
Closure of engineering facility | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
Closure of engineering facility | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
Closure of engineering facility | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								2
European labor reductions
Restructuring Cost and Reserve [Line Items]
Restructuring costs								2
European labor reductions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								2
European labor reductions | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
European labor reductions | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs								1	3
Other | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								1	1
Other | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0	1
Other | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs								$ 0	1
South America labor reduction I
Restructuring Cost and Reserve [Line Items]
Restructuring costs									7
South America labor reduction I | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs									7
South America labor reduction I | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs									0
South America labor reduction I | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs									$ 0
Variable labor reductions
Restructuring Cost and Reserve [Line Items]
Restructuring costs										5
Variable labor reductions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs										5
Variable labor reductions | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs										0
Variable labor reductions | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs										0
Segment reorganization and Asia Pacific realignment
Restructuring Cost and Reserve [Line Items]
Restructuring costs										16
Segment reorganization and Asia Pacific realignment | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs										10
Segment reorganization and Asia Pacific realignment | Aftermarket & Trailer
Restructuring Cost and Reserve [Line Items]
Restructuring costs										3
Segment reorganization and Asia Pacific realignment | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs										$ 3