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Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Taxes for Unallocated and Other (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest expense	$ (13)us-gaap_InterestExpense	$ (14)us-gaap_InterestExpense
Less: Equity in earnings of affiliated companies, net of tax	1	2
Income from continuing operations before income taxes and equity in earnings of affiliated companies	51	109
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(13)	(14)
Total certain items, pre-tax	(26)	24
Less: Equity in earnings of affiliated companies, net of tax	(1)	(2)
Unallocated corporate costs	(12)	(13)
General unallocated income	6
Income from continuing operations before income taxes and equity in earnings of affiliated companies	$ (46)	$ (5)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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