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Fair Value Measurements Other Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Carrying value of long-term debt and current portion of long-term debt $ 9,307 $ 9,536
Fair value of long-term debt and current portion of long-term debt $ 9,683 $ 9,665