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Fair Value Measurements
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Fair Value Measurements

Note 15 – Fair Value Measurements

Our assets and liabilities that are measured and recorded at fair value on our Balance Sheets on a recurring basis consist of our short-term investments, investments held in a Rabbi Trust (Note 1), and derivative assets and liabilities. The following table presents these assets and liabilities and their level within the fair value hierarchy:

 

Our cash equivalents include highly liquid instruments with original maturities of 90 days or less. Due to the short maturity of these instruments, the carrying amount on our Balance Sheets approximates fair value. Our accounts receivable and accounts payable are carried at cost, which approximates fair value. The estimated fair values of our long-term debt instruments at December 31, 2011 and 2010, aggregated approximately $7.8 billion and $6.2 billion, compared with a carrying amount of approximately $7.0 billion and $5.5 billion, which excludes $506 million and $505 million of unamortized discounts. The fair values were estimated based on quoted market prices of debt with terms and due dates similar to our long-term debt instruments.