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Fair Value of Financial Instruments (Schedule of the Fair Value of Derivative Instruments in the Consolidated Balance Sheet) (Details) (Designated as Hedging Instrument [Member], Other Long-term Liabilities [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Designated as Hedging Instrument [Member] | Other Long-term Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Liability derivatives designated as hedging instruments $ 74 $ 124