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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Measurements [Abstract]
Debt obligations, fair value	$ 27,640	$ 23,970
Long-term Debt	$ 26,293	$ 23,199

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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