Financial Instruments And Risk Management (Effect Of Derivative Instruments On Statements Of Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Financial Instruments And Risk Management [Abstract]
Amount of Gain (Loss) Recognized in OCI on Derivative	$ 190	[1]	$ 72	[1]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	313	[1]	(144)	[1]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 28	[2]	$ 2	[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)