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Fair Value Measurements Other Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Other Fair Value Measurements [Line Items]    
Carrying value of long-term debt and current portion of long-term debt $ 8,999 $ 9,536
Fair Value, Inputs, Level 2 [Member]
   
Other Fair Value Measurements [Line Items]    
Fair value of long-term debt and current portion of long-term debt $ 9,366 $ 9,665