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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table provides the components of accumulated other comprehensive loss (in millions):
 
 
Successor
 
 
December 31,
2012
 
December 31,
2011
Unrecognized actuarial losses and prior service credit, net of tax (see Note 15)
 
$
(241
)
 
$
(213
)
Fuel/interest hedge mark-to-market, net of tax (see Note 6)
 
—

 
11

Accumulated other comprehensive loss of equity method investees
 
(4
)
 
(1
)
      Total accumulated other comprehensive loss
 
$
(245
)
 
$
(203
)