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Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Asset Fair Value Gross Asset $ 7 $ 3
FTR [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current $ 7 $ 3