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Fair Value Measurements (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurements (Textual) [Abstract]
Minimum days to maturity of investments	90 days
Long-term debt, fair value	$ 18,946.9
Long-term debt, carrying value	$ 19,943.6	$ 19,799.9

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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