RESTRUCTURING COSTS (Details Textuals) $ in Millions	3 Months Ended							12 Months Ended
	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) position	Sep. 30, 2014 USD ($) position	Sep. 30, 2013 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1	$ 9	$ 3	$ 3	$ 7	$ 2	$ 1	$ 16	$ 10	$ 23
Employee separation
Restructuring Cost and Reserve [Line Items]
Restructuring costs								15	10	18
Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								14	8	17
M2016 Strategy | Commercial Truck & Industrial | Employee separation
Restructuring Cost and Reserve [Line Items]
Restructuring costs								5
Cost incurred to date	7							$ 7
M2016 Strategy | Hourly and Salaried Positions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Number of positions expected to be eliminated | position								40
Number of positions eliminated | position								140
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 | Hourly Positions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position									190
South America labor reduction I | Salaried Position | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position									20
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 | Commercial Truck & Industrial | Employee separation
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	6							$ 6
South America labor reduction II | Hourly Positions | Commercial Truck & Industrial | Employee separation
Restructuring Cost and Reserve [Line Items]
Number of positions expected to be eliminated | position								230
South America labor reduction II | Salaried Position | Commercial Truck & Industrial | Employee separation
Restructuring Cost and Reserve [Line Items]
Number of positions expected to be eliminated | position								20
Closure of engineering facility
Restructuring Cost and Reserve [Line Items]
Restructuring costs								$ 2
Closure of engineering facility | Employee separation
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	$ 2							2
Closure of engineering facility | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs								$ 0
Closure of engineering facility | Hourly and Salaried Positions
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position								30
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
Cost incurred to date			$ 2
European labor reductions | Hourly Positions | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			20
European labor reductions | Salaried Position | Commercial Truck & Industrial
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			20
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
Segment reorganization and Asia Pacific realignment
Restructuring Cost and Reserve [Line Items]
Restructuring costs										16
Segment reorganization and Asia Pacific realignment | Employee Severance Charges and Other Exit Costs
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 | Hourly Positions
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position										50
Segment reorganization and Asia Pacific realignment | Salaried Position
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position										200