MILEAGE PLAN MILEAGE PLAN (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Mileage Plan [Line Items]
Other accrued liabilities	$ 706		$ 706		$ 624
Deferred revenue	342		342		335
Other liabilities	315		315		308
Total passenger revenue	1,174	1,088	2,214	2,066
Other - net	169	138	327	268
Liabilities From Mileage Plan [Member]
Mileage Plan [Line Items]
Other accrued liabilities	340		340		314
Deferred revenue	333		333		323
Other liabilities	20		20		19
Liabilities	693		693		656
Revenue From Mileage Plan [Member]
Mileage Plan [Line Items]
Total passenger revenue	62	50	118	96
Other - net	73	56	146	110
Total Mileage Plan Revenues	$ 135	$ 106	$ 264	$ 206