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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Summarized Financial Information for Discontinued Operations
Summarized results of discontinued operations:
(in millions)
Year ended December 31, 2013
 
351 days ended December 16, 2012
 
Year ended December 31, 2011
Operating revenue
$

 
$
1,626

 
$
2,180

Loss before income taxes

 
(2,235
)
 
(1,931
)