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Financial Instruments
9 Months Ended
Sep. 30, 2011
Financial Instruments [Abstract] 
Financial Instruments
3. Financial Instruments
     At September 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 September 30, 2011 and December 31, 2010, we had an interest bearing note receivable from EPB of $54 million and $63 million due upon demand with a variable interest rate of 2.2% and 0.8%. 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 the 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 other financing obligations, and their estimated fair values, which are based on quoted market prices for the same or similar issues, are as follows:
                                 
    September 30, 2011   December 31, 2010
    Carrying   Fair   Carrying   Fair
    Amount   Value   Amount   Value
            (In millions)        
Long-term debt and other financing obligations, including current maturities
  $ 652     $ 707     $ 654     $ 703