Discontinued Operations (Components of Discontinued Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]
Net sales and other operating revenues				$ 46
Income from operations before income taxes				21
Provision for income taxes on operations				(7)
Income from operations, net of tax				14
Gain (loss) on sale of discontinued operations		6	(2)	300
Benefit from (provision for) income taxes on gain (loss) on sale	2	(2)	3	(110)
Gain on sale of discontinued operations, net of tax	2	4	1	190
Income from discontinued operations, net of tax	$ 2	$ 4	$ 1	$ 204