Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following are included in the results above:

	Three Months Ended
(in millions)	March 31			June 30			September 30			December 31
2013
Facilities, fleet and other	$	(102	)	$	(34	)	$	(128	)	$	(160	)
MTM adjustments	24			(125		)	285			92
Release of tax valuation allowance	—			—			—			7,989
Total income (loss)	$	(78	)	$	(159	)	$	157		$	7,921
2012
Severance and related cost	$	—		$	(171	)	$	(66	)	$	—
Facilities, fleet and other	(27		)	(22		)	(122		)	(122		)
Gain on slot exchange	39			—			39			—
Loss on extinguishment of debt	—			—			(12		)	(106		)
MTM adjustments	151			(561		)	440			(3		)
Total income (loss)	$	163		$	(754	)	$	279		$	(231	)

	Three Months Ended
(in millions, except per share data)	March 31		June 30			September 30		December 31
2013
Operating revenue	$	8,500	$	9,707		$	10,490	$	9,076
Operating income	222		914			1,563		701
Net income	7		685			1,369		8,479
Basic earnings per share	$	0.01	$	0.81		$	1.61	$	10.02
Diluted earnings per share	$	0.01	$	0.80		$	1.59	$	9.89
2012
Operating revenue	$	8,413	$	9,732		$	9,923	$	8,602
Operating income	382		134			1,308		352
Net income (loss)	124		(168		)	1,047		7
Basic earnings (loss) per share	$	0.15	$	(0.20	)	$	1.24	$	0.01
Diluted earnings (loss) per share	$	0.15	$	(0.20	)	$	1.23	$	0.01