Financial Instruments And Risk Management (Effect Of Derivative Instruments On Statements Of Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of gain (loss) recognized in OCI on derivative	$ (56)	[1]	$ (104)	[1]	$ (70)	[1]	$ (56)	[1]
Derivative instruments, income statement location of Gain (loss) reclassified from accumulated OCI					Aircraft Fuel	[1]
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net	(13)	[1]	(1)	[1]	(12)	[1]	25	[1]
Derivative instruments income statement location of gain loss on ineffectiveness recognized in income on derivative					Aircraft Fuel	[2]
Amount of gain (loss) recognized in income, ineffectiveness	$ (18)	[2]	$ (8)	[2]	$ (11)	[2]	$ (5)	[2]

[1] Effective portion of gain (loss)

[2] Ineffective portion of gain (loss)