INCOME TAXES - Summary of the Tax Effects of Temporary Differences (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accrued compensation and benefits	$ 32	$ 21
Accrued product warranties	14	13
Inventory costs	9	8
Receivables	18	15
Accrued retiree healthcare benefits	39	169
Retirement pension plans	92	119
Property	10	7
Loss and credit carryforwards	349	455
Other	71	67
Sub-total	634	874
Less: Valuation allowances	(307)	(379)
Deferred income taxes - asset	327	495
Taxes on undistributed income	(7)	(7)
Intangible assets	(87)	(82)
Debt basis difference	(16)	(5)
Deferred income taxes - liability	(110)	(94)
Net deferred income tax assets	$ 217	$ 401