OTHER CURRENT LIABILITIES - Schedule of Product Warranties (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Other Liabilities, Current [Roll Forward]
Total product warranties - beginning of year	$ 44	$ 48	$ 51
Accruals for product warranties	14	10	15
Payments	(17)	(14)	(18)
Change in estimates and other	4	0	0
Total product warranties - end of year	45	44	48
Less: non-current product warranties (see Note 16)	(27)	(26)	(26)
Product warranties	$ 18	$ 18	$ 22