Supplemental Guarantor Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$ 30		$ 39
INVESTING ACTIVITIES
Capital expenditures	(40)		(47)
Other investing activities	0		3
Net investing cash flows provided by discontinued operations	2		4
CASH USED FOR INVESTING ACTIVITIES	(38)		(40)
FINANCING ACTIVITIES
Repayment of notes			(55)
Repurchase of common stock	0		(43)
Debt issuance costs	(4)		0
Intercompany advances	0		0
Other financing activities	(11)		(2)
CASH USED FOR FINANCING ACTIVITIES	(15)		(100)
EFFECT OF CHANGES IN FOREIGN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	1		2
CHANGE IN CASH AND CASH EQUIVALENTS	(22)		(99)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	160	[1]	193
CASH AND CASH EQUIVALENTS AT END OF PERIOD	138	[1]	94
Elims
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED FOR) OPERATING ACTIVITIES	0		0
INVESTING ACTIVITIES
Capital expenditures	0		0
Other investing activities			0
Net investing cash flows provided by discontinued operations	0		0
CASH USED FOR INVESTING ACTIVITIES	0		0
FINANCING ACTIVITIES
Repayment of notes			0
Repurchase of common stock			0
Debt issuance costs	0
Intercompany advances	0		0
Other financing activities	0		0
CASH USED FOR FINANCING ACTIVITIES	0		0
EFFECT OF CHANGES IN FOREIGN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	0		0
CHANGE IN CASH AND CASH EQUIVALENTS	0		0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0		0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0		0
Parent | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(51)		(20)
INVESTING ACTIVITIES
Capital expenditures	(6)		(12)
Other investing activities			0
Net investing cash flows provided by discontinued operations	0		0
CASH USED FOR INVESTING ACTIVITIES	(6)		(12)
FINANCING ACTIVITIES
Repayment of notes			(55)
Repurchase of common stock			(43)
Debt issuance costs	(4)
Intercompany advances	38		81
Other financing activities	0		0
CASH USED FOR FINANCING ACTIVITIES	34		(17)
EFFECT OF CHANGES IN FOREIGN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	0		0
CHANGE IN CASH AND CASH EQUIVALENTS	(23)		(49)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	90		73
CASH AND CASH EQUIVALENTS AT END OF PERIOD	67		24
Guarantors | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED FOR) OPERATING ACTIVITIES	21		18
INVESTING ACTIVITIES
Capital expenditures	(21)		(22)
Other investing activities			4
Net investing cash flows provided by discontinued operations	2		1
CASH USED FOR INVESTING ACTIVITIES	(19)		(17)
FINANCING ACTIVITIES
Repayment of notes			0
Repurchase of common stock			0
Debt issuance costs	0
Intercompany advances	0		0
Other financing activities	(2)		(2)
CASH USED FOR FINANCING ACTIVITIES	(2)		(2)
EFFECT OF CHANGES IN FOREIGN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	0		0
CHANGE IN CASH AND CASH EQUIVALENTS	0		(1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	4		6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4		5
Non- Guarantors | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
CASH FLOWS PROVIDED BY (USED FOR) OPERATING ACTIVITIES	60		41
INVESTING ACTIVITIES
Capital expenditures	(13)		(13)
Other investing activities			(1)
Net investing cash flows provided by discontinued operations	0		3
CASH USED FOR INVESTING ACTIVITIES	(13)		(11)
FINANCING ACTIVITIES
Repayment of notes			0
Repurchase of common stock			0
Debt issuance costs	0
Intercompany advances	(38)		(81)
Other financing activities	(9)		0
CASH USED FOR FINANCING ACTIVITIES	(47)		(81)
EFFECT OF CHANGES IN FOREIGN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	1		2
CHANGE IN CASH AND CASH EQUIVALENTS	1		(49)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	66		114
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 67		$ 65

[1] As of March 31, 2017, Assets and Liabilities held for sale were: (i) $1 million Cash and cash equivalents; (ii) $8 million Receivables, trade and other, net; (iii) $1 million Inventories; (iv) $1 million Goodwill; (v) $6 million Accounts and notes payable; and (vi) $2 million Noncontrolling interests. As of September 30, 2016, Assets and Liabilities held for sale were: (i) $1 million Cash and cash equivalents; (ii) $8 million Receivables, trade and other, net; (iii) $1 million Inventories; (iv) $3 million Net property; (v) $5 million Accounts and notes payable; and (vi) $3 million Noncontrolling interests.