OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Operating Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Operating Cash Flow Disclosure [Abstract]
Net income	$ 238	$ 51	$ 23	$ 16	$ 474	$ 42	$ 32	$ 27	$ 328	$ 575	$ 65
Less: Loss from discontinued operations, net of tax									(1)	(4)	(1)
Income from continuing operations									329	579	66
Adjustments to income from continuing operations to arrive at cash provided by operating activities:
Depreciation and amortization									75	67	65
Deferred income tax expense (benefit)									38	(415)	(24)
Restructuring costs									6	16	16
Loss on debt extinguishment	$ 36								36	0	25
Goodwill and asset impairment									4	0	17
Equity in earnings of other affiliates									(48)	(36)	(39)
Stock compensation expense									19	9	10
Provision for doubtful accounts									1	2	2
Pension and retiree medical expense									11	20	82
Gain on sale of equity method investment									(243)	0	0
Gain on sale of property									0	(2)	(3)
Dividends received from other equity method investments									44	37	32
Pension and retiree medical contributions									(38)	(42)	(141)
Restructuring payments									(15)	(11)	(16)
Changes in off-balance sheet receivable securitization and factoring programs									26	(31)	39
Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations:
Receivables									(160)	89	54
Inventories									(43)	28	4
Accounts payable									133	(89)	(70)
Other current assets and liabilities									16	(18)	(52)
Other assets and liabilities									(12)	6	40
Operating cash flows provided by continuing operations									179	209	107
Operating cash flows used for discontinued operations									(3)	(5)	(10)
CASH PROVIDED BY OPERATING ACTIVITIES									$ 176	$ 204	$ 97