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, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
NET INCOME	$ 41	$ 89	$ 74	$ 92	$ 33	$ 67	$ 60	$ (34)	$ 296	$ 126	$ 328
Less: Income (loss) from discontinued operations, net of tax									1	(3)	(1)
Income from continuing operations									295	129	329
Adjustments to income from continuing operations to arrive at cash provided by operating activities:
Depreciation and amortization									87	84	75
Deferred income tax expense									40	74	38
Restructuring costs									8	6	6
Loss on debt extinguishment									0	8	36
Asset impairment									10	3	4
Equity in earnings of affiliates									(31)	(27)	(48)
Stock compensation expense									18	20	19
Provision for doubtful accounts									0	(1)	1
Pension and retiree medical expense (income)									(37)	(31)	11
Settlement loss									0	6	0
Asbestos related liability remeasurement									(31)	0	0
Contribution to Maremont trust									(48)	0	0
Gain on sale of equity method investment									0	0	(243)
Dividends received from equity method investments									23	17	44
Pension and retiree medical contributions									(16)	(21)	(38)
Restructuring payments									(5)	(8)	(15)
Changes in off-balance sheet receivable securitization and factoring programs									(18)	11	26
Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations:
Receivables									80	(98)	(160)
Inventories									9	(112)	(43)
Accounts payable									(103)	97	133
Other current assets and liabilities									(3)	36	16
Other assets and liabilities									(22)	59	(12)
Operating cash flows provided by continuing operations									256	252	179
Operating cash flows used for discontinued operations									0	(1)	(3)
CASH PROVIDED BY OPERATING ACTIVITIES									$ 256	$ 251	$ 176