COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
AOCI Beginning Balance	$ (57)		$ (224)
Changes in fair value, other	(291)		(147)
Reclassification to earnings, other	28		51
AOCI Ending Balance	(320)		(320)
Net Income	228	161	327	166
Other, net of deferred taxes	(4)	3	(2)	6
Total other comprehensive income (loss)	(263)	(186)	(96)	155
Total comprehensive income	(35)	(25)	231	321
Deferred taxes on unrealized gain (loss) on other	(3)	2	(1)	4
Fuel hedge derivatives [Member]
AOCI Beginning Balance	(24)		(183)
Changes in fair value, derivatives	(279)		(143)
Reclassification to earnings, derivatives	28		51
AOCI Ending Balance	(275)		(275)
Unrealized gain (loss) on derivatives, net of tax	(251)	(178)	(92)	153
Deferred taxes on unrealized gain (loss) on derivatives	(156)	(111)	(57)	96
Interest Rate Swap [Member]
AOCI Beginning Balance	(60)		(66)
Changes in fair value, derivatives	(8)		(2)
AOCI Ending Balance	(68)		(68)
Unrealized gain (loss) on derivatives, net of tax	(8)	(11)	(2)	(4)
Deferred taxes on unrealized gain (loss) on derivatives	(5)	(7)	(1)	(3)
Other [Member]
AOCI Beginning Balance	27		25
Changes in fair value, other	(4)		(2)
AOCI Ending Balance	$ 23		$ 23