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Acquisition Accounting Pro Forma Results (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition [Line Items]        
Operating revenue $ 452 $ 532 $ 1,412 $ 1,671
Net (loss) $ (59) $ (62) $ (212) $ (112)