OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Supplemental Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Balance sheet data:
Allowance for doubtful accounts	$ 5	$ 6	$ 9
Statement of operations data:
Maintenance and repairs expense	46	45	52
Research, development and engineering expense	69	68	69
Depreciation expense	67	61	60
Rental expense	14	15	11
Interest income	3	3	9
Interest expense	(122)	(87)	(114)
Statement of cash flows data:
Interest payments	75	71	64
Income tax payments, net of refunds	22	24	14
Non-cash investing activities - capital asset additions from capital leases	$ 0	$ 0	$ 9