Financial Instruments And Risk Management (Effect Of Derivative Instruments On Statements Of Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of Gain (Loss) Recognized in OCI on Derivative	$ 86	[1]	$ (142)	[1]	$ 29	[1]	$ 152	[1]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(12)	[1]	57	[1]	13	[1]	287	[1]
Amount of Gain (Loss) Recognized in Income, Ineffectiveness	$ 2	[2]	$ (26)	[2]	$ (3)	[2]	$ (19)	[2]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income					Aircraft Fuel	[1]
Location Of Gain (Loss) Recognized in Income on Derivative					Aircraft Fuel	[2]

[1] Effective portion of gain (loss

[2] Ineffective portion of gain (loss