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, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Disclosure Of Fair Value Of Financial Instruments [Abstract]    
Fair value of Company's long-term debt $ 2.1 $ 2.1
Book value of Company's long-term debt $ 1.9 $ 1.9