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Financial Instruments (Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Collateral posted to counterparties	$ 38
Maximum collateral balance could have been required to post	64
Fair value of long-term debt	5,034
Fair value of long-term debt compared with carrying value	680
Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	16	17
Fair value of derivative liabilities	(29)	(48)
Commodity Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	1	0
Fair value of derivative liabilities	$ (51)	$ (83)

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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