FAIR VALUE MEASUREMENTS (Currency Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amounts, foreign currency derivatives	$ 79
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative gain (loss)	9	$ 2	$ (17)
Foreign Exchange Contract [Member] | Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative assets	2	3
Notional amounts, foreign currency derivatives		325
Foreign Exchange Contract [Member] | Accrued Expenses and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative liabilities	36	4
Notional amounts, foreign currency derivatives	$ 1,601	$ 528