Discontinued Operations (Components Income (Loss) from Discontinued Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales and other operating revenues									$ 46	$ 201	$ 177
Income from operations before income taxes									21	84	42
Provision for income taxes on operations									(7)	(31)	(16)
Income from operations, net of tax									14	53	26
Gain on sale of discontinued operations									300
Provision for income taxes on gain on sale									(109)
Gain on sale of discontinued operations, net of tax									191
Income from discontinued operations, net of tax	$ 1	$ 4	$ 189	$ 11	$ 8	$ 13	$ 16	$ 16	$ 205	$ 53	$ 26