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Financial Instruments
6 Months Ended
Jun. 30, 2011
Financial Instruments [Abstract]  
Financial Instruments
2. Financial Instruments
     At June 30, 2011 and December 31, 2010, the carrying amounts of cash and cash equivalents and trade receivables and payables represent fair value because of the short-term nature of these instruments. At June 30, 2011 and December 31, 2010, we had an interest bearing note receivable from El Paso Corporation (El Paso) of $874 million and $976 million due upon demand, with a variable interest rate of 2.4% and 1.5%. While we are exposed to changes in interest income based on changes to the variable interest rate, the fair value of this note receivable approximates its carrying value due to the note being due on demand and the market-based nature of the interest rate.
     In addition, the carrying amounts of our long-term debt and their estimated fair values, which are based on quoted market prices for the same or similar issues, are as follows:
                                 
    June 30, 2011     December 31, 2010  
    Carrying     Fair     Carrying     Fair  
    Amount     Value     Amount     Value  
    (In millions)  
Long-term debt, including current maturities
  $ 1,853     $ 2,238     $ 1,851     $ 2,071