BUSINESS SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total sales	$ 853	$ 909	$ 864	$ 879	$ 933	$ 979	$ 954	$ 900	$ 3,505	$ 3,766	$ 3,672
Commercial Truck & Industrial
Segment Reporting Information [Line Items]
Total sales									2,649	2,876	2,825
Aftermarket & Trailer
Segment Reporting Information [Line Items]
Total sales									856	890	847
Operating Segments
Segment Reporting Information [Line Items]
Total sales									3,505	3,766	3,672
Operating Segments | Commercial Truck & Industrial
Segment Reporting Information [Line Items]
Total sales									2,739	2,980	2,920
Operating Segments | Aftermarket & Trailer
Segment Reporting Information [Line Items]
Total sales									884	920	871
Eliminations
Segment Reporting Information [Line Items]
Total sales									(118)	(134)	(119)
Eliminations | Commercial Truck & Industrial
Segment Reporting Information [Line Items]
Total sales									90	104	95
Eliminations | Aftermarket & Trailer
Segment Reporting Information [Line Items]
Total sales									$ 28	$ 30	$ 24