Financial Instruments And Risk Management (Effect Of Derivative Instruments On Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	$ (1)		$ 24	[1]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(3)		277	[2]
Amount of Gain (Loss) Recognized in OCI on Derivative	$ 12		$ 190	[2]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	Aircraft Fuel	[2]
Location Of Gain (Loss) Recognized in Income on Derivative	Aircraft Fuel	[1]

[1] Ineffective portion of gain (loss)

[2] Effective portion of gain (loss)