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Financial Instrucments Fair Value by Balance Sheet Location (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Foreign Currency Exchange Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
  
Derivatives Fair Value By Balance Sheet Location [Line Items]  
Derivative Asset, Fair Value, Net$ 16$ 16
Derivative Liability, Fair Value, Net4014
Available for sale Securities [Member] | Fair Value, Inputs, Level 1 [Member]
  
Derivatives Fair Value By Balance Sheet Location [Line Items]  
Derivative Asset, Fair Value, Net332322
Interest Rate Swap Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
  
Derivatives Fair Value By Balance Sheet Location [Line Items]  
Derivative Asset, Fair Value, Net13522
Commodity Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
  
Derivatives Fair Value By Balance Sheet Location [Line Items]  
Derivative Asset, Fair Value, Net12
Derivative Liability, Fair Value, Net$ 3$ 2