MILEAGE PLAN MILEAGE PLAN (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Mileage Plan [Line Items]
Other accrued liabilities	$ 680		$ 680		$ 624
Deferred revenue	356		356		335
Other liabilities	312		312		308
Total passenger revenue	1,249	1,168	3,463	3,233
Other - net	184	165	511	433
Special Revenue	0	192	0	192
Liabilities From Mileage Plan [Member]
Mileage Plan [Line Items]
Other accrued liabilities	346		346		314
Deferred revenue	348		348		323
Other liabilities	21		21		19
Liabilities	715		715		656
Revenue From Mileage Plan [Member]
Mileage Plan [Line Items]
Total passenger revenue	62	54	180	150
Other - net	77	74	223	184
Special Revenue	0	192	0	192
Total Mileage Plan Revenues	$ 139	$ 320	$ 403	$ 526