MILEAGE PLAN MILEAGE PLAN (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Mileage Plan [Line Items]
Other accrued liabilities	$ 672		$ 624
Deferred revenue	334		335
Other liabilities	309		308
Total passenger revenue	1,040	978
Other - net	158	129
Liabilities From Mileage Plan [Member]
Mileage Plan [Line Items]
Other accrued liabilities	335		314
Deferred revenue	324		323
Other liabilities	19		19
Liabilities	678		656
Revenue From Mileage Plan [Member]
Mileage Plan [Line Items]
Total passenger revenue	55	46
Other - net	73	54
Total Mileage Plan Revenues	$ 128	$ 100