Fair Value of Financial Investments and Liabilities (Details Textuals) (USD $) In Billions	Jun. 30, 2011	Dec. 31, 2010
Fair Value of Financial Investments and Liabilities (Textuals) [Abstract]
Estimated market value of long-term and short-term debt	$ 4.1	$ 4.2
Aggregate carrying value of long-term and short-term debt	$ 4.1	$ 4.1

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