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Fair Value Measurement (Fair Value of Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value Disclosures [Abstract]    
Long-term debt, including current portion, Carrying Amount $ 4,996 $ 4,912
Long-term debt, including current portion, Fair Value $ 3,369 $ 3,716