Derivative And Financial Instruments (Effect Of Derivative Instruments On Statements Of Operations) (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Derivative And Financial Instruments
Amount of Gain (Loss) Recognized in OCI on Derivative	$ (142)	[1]	$ 67	[1]	$ 152	[1]	$ (56)	[1]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	57	[1]	(30)	[1]	287	[1]	(133)	[1]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (26)	[2]	$ 9	[2]	$ (19)	[2]	$ (2)	[2]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	Aircraft Fuel	[1]			Aircraft Fuel	[1]
Location Of Gain (Loss) Recognized in Income on Derivative	Aircraft Fuel	[2]			Aircraft Fuel	[2]

[1] Effective portion of gain (loss)

[2] Ineffective portion of gain (loss)