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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Long-Term Debt
Carrying amount of total long-term debt exclusive of capital leases	$ 739	$ 739
Fair market value	$ 746	$ 715

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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