RESTRUCTURING COSTS (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	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start				$ 11			$ 12	$ 11	$ 12	$ 15
Charges to continuing operations	$ 1	$ 9	$ 3	3	$ 7	$ 2	1	16	10	23
Charges to discontinued operations								0	0	3
Asset write-offs								(1)		(1)
Cash payments – continuing operations								(16)	(10)	(23)
Cash payments – discontinued operations										(3)
Other									(1)	(2)
Restructuring reserve, period end	10				11			10	11	12
Less: non-current restructuring reserves	(3)				(2)			(3)	(2)
Restructuring reserves – current	7				9			7	9
Employee Termination Benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start				11			12	11	12	15
Charges to continuing operations								15	10	18
Charges to discontinued operations										3
Asset write-offs								0		0
Cash payments – continuing operations								(16)	(10)	(19)
Cash payments – discontinued operations										(3)
Other									(1)	(2)
Restructuring reserve, period end	10				11			10	11	12
Less: non-current restructuring reserves	(3)							(3)
Restructuring reserves – current	7							7
Asset Impairment
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start				0			0	0	0	0
Charges to continuing operations								1	0	1
Charges to discontinued operations										0
Asset write-offs								(1)		(1)
Cash payments – continuing operations								0	0	0
Cash payments – discontinued operations										0
Other									0	0
Restructuring reserve, period end	0				0			0	0	0
Less: non-current restructuring reserves	0							0
Restructuring reserves – current	0							0
Plant Shutdown & Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start				$ 0			$ 0	0	0	0
Charges to continuing operations								0	0	4
Charges to discontinued operations										0
Asset write-offs								0		0
Cash payments – continuing operations								0	0	(4)
Cash payments – discontinued operations										0
Other									0	0
Restructuring reserve, period end	0				$ 0			0	$ 0	$ 0
Less: non-current restructuring reserves	0							0
Restructuring reserves – current	$ 0							$ 0