Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

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
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	)
2011
Severance and related cost	$	—		$	(80	)	$	(3	)	$	(52	)
Facilities, fleet and other	(7		)	(64		)	—			(29		)
Intangible asset impairment	—			—			—			(50		)
Gain on divestiture of slots	—			—			—			43
Loss on extinguishment of debt	(20		)	(13		)	(5		)	(30		)
MTM adjustments	29			(11		)	(208		)	164
Total income (loss)	$	2		$	(168	)	$	(216	)	$	46

	Three Months Ended
(in millions, except per share data)	March 31			June 30			September 30		December 31
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
2011
Operating revenue	$	7,747		$	9,153		$	9,816	$	8,399
Operating (loss) income	(92		)	481			860		726
Net (loss) income	(318		)	198			549		425
Basic (loss) earnings per share	$	(0.38	)	$	0.24		$	0.66	$	0.51
Diluted (loss) earnings per share	$	(0.38	)	$	0.23		$	0.65	$	0.50