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Financial Instruments (Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Collateral posted to counterparties	$ 0
Maximum collateral balance could have been required to post	11
Fair value of long-term debt compared with carrying value	656
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of long-term debt	5,232
Foreign Exchange Contract [Member] \| Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	39	31
Foreign Exchange Contract [Member] \| Other Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	8	8
Commodity Contract [Member] \| Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0	9
Commodity Contract [Member] \| Other Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 11	$ 7

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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