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Fair Value Measurement (Additional Information) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Impaired Long-Lived Assets Held and Used [Line Items]
Long-term debt (excluding capital lease obligations), carrying values	$ 3,344	$ 3,346
Long-term debt (excluding capital lease obligations), fair values	3,726	3,683
Level 3 [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets carrying amount	$ 0

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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