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Acquisition Accounting Pro Forma Results (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition [Line Items]        
Operating revenue $ 474 $ 558 $ 960 $ 1,139
Net (loss) (85) (5) (153) (50)
Revenue, Net 474 335 930 623
Pro Forma Adjustment [Member]
       
Business Acquisition [Line Items]        
Revenue, Net $ 1