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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value of Long-Term Debt Recorded at Carrying Value    
Long-term debt, including current portion $ 13,746 $ 12,419
Long-term debt, including current portion, fair value $ 14,264 $ 12,360