Debt and Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Sep. 30, 2010
Short-term debt
Bank borrowings and commercial paper	$ 596	$ 75
Weighted average interest rate on short-term debt outstanding	2.40%	6.20%

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant