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Financial Instruments (Schedule Of Fair Values Of Derivative Contracts Outstanding) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Financial Instruments [Line Items]    
Collateral balance posted $ 0  
Collateral held from counterparties 0  
Collateral balance could have been required to post 2  
Fair value of long-term debt 5,088 5,276
Fair value of long-term debt compared with carrying value 741 673
Foreign Currency Derivatives [Member]
   
Financial Instruments [Line Items]    
Fair value of derivative assets 31 17
Fair value of derivative liabilities 8 48
Commodity Derivatives [Member]
   
Financial Instruments [Line Items]    
Fair value of derivative assets 9 0
Fair value of derivative liabilities $ 7 $ 83