MILEAGE PLAN MILEAGE PLAN (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Mileage Plan [Line Items]
Other accrued liabilities	$ 757		$ 757		$ 661
Deferred revenue	480		480		431
Other liabilities	366		366		362
Passenger revenues	1,263	$ 1,231	2,396	$ 2,318
Other - net revenues	204	176	394	335
Liabilities From Mileage Plan [Member]
Mileage Plan [Line Items]
Other accrued liabilities	391		391		368
Deferred revenue	477		477		427
Other liabilities	19		19		19
Total	887		887		$ 814
Revenue From Mileage Plan [Member]
Mileage Plan [Line Items]
Passenger revenues	73	69	143	134
Other - net revenues	108	82	211	159
Total Mileage Plan Revenues	$ 181	$ 151	$ 354	$ 293