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Fair Value Measurements and Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 5,465	$ 5,484
Carrying Value [Member]
Debt Instrument [Line Items]
Long-term debt	$ 5,265	$ 5,176

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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