Quarterly report pursuant to Section 13 or 15(d)

Disclosure Of Fair Value Of Financial Instruments (Details)

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Disclosure Of Fair Value Of Financial Instruments (Details) (USD $)
In Billions
Jun. 30, 2011
Dec. 31, 2010
Disclosure Of Fair Value Of Financial Instruments    
Fair value of company's long-term debt $ 2.0 $ 2.2
Book value of company's long-term debt $ 1.9 $ 2.1