Merger And Integration-Related Costs And Special Items (Accrual Activity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Permanently Grounded Aircraft [Member]
Schedule of Accrual Activity [Line Items]
Beginning Balance	$ 41	$ 83	$ 16
Accrual	5	(3)	87
Payments	(15)	(39)	(20)
Ending Balance	31	41	83
Severance/ Medical Costs [Member]
Schedule of Accrual Activity [Line Items]
Beginning Balance	102	45	81
Accrual	21	155	33
Payments	(68)	(101)	(69)
Liability assumed due to Merger		3
Ending Balance	55	102	45
Unused Facilities [Member]
Schedule of Accrual Activity [Line Items]
Beginning Balance	7
Payments	(3)	(26)
Liability assumed due to Merger		33
Ending Balance	$ 4	$ 7