Derivative Activities (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The table below contains a summary of all derivative positions reported in the Consolidated Financial Statements, presented gross of any master netting arrangements (in millions):

Fair Value of Derivative Instruments
Asset Derivatives
	Successor
	December 31, 2012		December 31, 2011		Balance Sheet Location
Asset derivatives designated as hedging instruments under ASC 815-20
Fuel Contracts	$	—	$	24	Other current assets
Total asset derivatives designated as hedging instruments under ASC 815-20	$	—	$	24
Total asset derivatives	$	—	$	24

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

The Effects of Derivative Instruments Gains and Losses for the Year Ended December 31, 2012 (Successor), the Year Ended December 31, 2011 (Successor), the Period February 13 – December 31, 2010 (Successor) and the Period January 1 – February 12, 2010 (Predecessor)
Derivatives in ASC 815-20 Cash Flow Hedging Relationships
	Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)
	Successor						Predecessor
	Year Ended		Year Ended		February 13 - December 31, 2010		January 1 - February 12, 2010
	December 31, 2012		December 31, 2011
Fuel Contracts	$	7	$	50	$	93	$	(79	)
Total derivatives	$	7	$	50	$	93	$	(79	)

		Amount of Gain or (Loss) Recognized from AOCL into Income (Effective Portion)
		Successor						Predecessor
	Location of Gain or (Loss) Recognized from AOCL into Income	Year Ended		Year Ended		February 13 - December 31, 2010		January 1 - February 12, 2010
		December 31, 2012		December 31, 2011
Fuel Contracts	Fuel expense	$	25	$	98	$	26	$	(6	)
Total derivatives		$	25	$	98	$	26	$	(6	)

		Amount of Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)a
		Successor								Predecessor
	Location of Gain or (Loss) Recognized in Income on Derivatives	Year Ended			Year Ended			February 13 - December 31, 2010		January 1 - February 12, 2010
		December 31, 2012			December 31, 2011
Fuel Contracts	Fuel expense	$	(3	)	$	(16	)	$	10	$	(7	)
Total derivatives		$	(3	)	$	(16	)	$	10	$	(7	)

^a  No portion of the gain or (loss) was excluded from the assessment of hedge effectiveness for the periods then ended.

The gain or loss on the fair value hedges as well as the offsetting loss or gain on the hedged items (fixed-rate debt) attributable to the hedged risk were recorded in current earnings. The Company included the gain or loss on the fixed-rate debt in the same line item (interest expense) as the offsetting loss or gain on the related interest rate swaps as follows (in millions):

	Gain on Interest Rate Swaps
	Successor						Predecessor
	Year Ended		Year Ended		February 13 - December 31, 2010		January 1 - February 12, 2010
Income Statement Classification	December 31, 2012		December 31, 2011
Interest expense	$	—	$	—	$	14	$	6

	Loss on Fixed-rate Debt
	Successor							Predecessor
	Year Ended		Year Ended		February 13 - December 31, 2010			January 1 - February 12, 2010
Income Statement Classification	December 31, 2012		December 31, 2011
Interest expense	$	—	$	—	$	(13	)	$	(6	)