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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]  
Summarized Financial Information for Discontinued Operations
The following table summarizes the results of discontinued operations for the periods presented:
 
Years ended December 31,
 
351 days ended December 16, 2012
(in millions)
2014
 
2013
 
Operating revenue
$

 
$

 
$
1,626

Loss before income taxes
(525
)
 

 
(2,235
)