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Financial Instruments (Fair Value Measurements) (Details) (USD $) In Millions	Jun. 30, 2011	Sep. 30, 2010
Collateral posted by counterparties	$ 0
Maximum collateral balance required to post	3
Fair value of long-term debt	5,057
Fair value of long-term debt compared with carrying value	453
Foreign Currency Derivatives [Member]
Fair value of derivative assets	33	67
Fair value of derivative liabilities	(15)	(50)
Commodity Derivatives [Member]
Fair value of derivative assets	12	31
Fair value of derivative liabilities	$ (4)	$ (3)

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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