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Fair Value Measurements (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 Value $ 8,827 $ 8,431
Long-term debt, including current portion, Fair Value $ 10,368 $ 10,129