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Fair Value Measurements (Details 3) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Financial Instruments    
Long-term debt (excluding current portion) $ 4,484 $ 4,183
Carrying Amount
   
Financial Instruments    
Long-term debt (excluding current portion) 4,484 4,183
Fair Value
   
Financial Instruments    
Long-term debt (excluding current portion) $ 4,740 $ 4,466