BUSINESS SEGMENT INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Total Sales	$ 933	$ 979	$ 954	$ 900	$ 902	$ 986	$ 900	$ 884	$ 3,766	$ 3,672	$ 4,384
Commercial Truck & Industrial [Member]
Segment Reporting Information [Line Items]
Total Sales									2,980	2,920	3,613
Aftermarket & Trailer [Member]
Segment Reporting Information [Line Items]
Total Sales									920	871	906
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Sales									(134)	(119)	(135)
External Sales [Member]
Segment Reporting Information [Line Items]
External Sales									3,766	3,672	4,384
External Sales [Member] | Commercial Truck & Industrial [Member]
Segment Reporting Information [Line Items]
External Sales									2,876	2,825	3,508
External Sales [Member] | Aftermarket & Trailer [Member]
Segment Reporting Information [Line Items]
External Sales									890	847	876
External Sales [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
External Sales									0	0	0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
External Sales									0	0	0
Intersegment Eliminations [Member] | Commercial Truck & Industrial [Member]
Segment Reporting Information [Line Items]
External Sales									104	95	105
Intersegment Eliminations [Member] | Aftermarket & Trailer [Member]
Segment Reporting Information [Line Items]
External Sales									30	24	30
Intersegment Eliminations [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
External Sales									$ (134)	$ (119)	$ (135)