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Fair Value Measurements (Fair Value of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Long-term debt, including current portion, Carrying Amount	$ 1,522	$ 1,056
Long-term debt, including current portion, Fair Value	$ 1,517	$ 1,057

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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