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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value of Long-Term Debt Recorded at Carrying Value    
Long-term debt, including current portion, Carrying Value $ 14,273 $ 13,746
Long-term debt, including current portion, Fair Value $ 14,452 $ 14,264