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Fair Value Measurements Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Measurements Textuals Abstract
Long-term debt and current portion of long term debt, carrying value	$ 10,076	$ 3,687
Long-term debt and current portion of long-term debt, fair value	$ 10,793	$ 4,273

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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