ACQUISITION OF VIRGIN AMERICA INC. - ASSETS ACQUIRED AND LIABILITIES ASSUMED (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 1,934	$ 1,934
Virgin America Inc.
Business Acquisition [Line Items]
Cash and cash equivalents	645	645
Receivables	54	44
Prepaid expenses and other current assets	18	16
Property and equipment	561	560
Intangible assets	141	143
Goodwill	1,934	1,934
Other assets	89	84
Total assets	3,442	3,426
Accounts payable	22	22
Accrued wages, vacation and payroll taxes	54	51
Air traffic liabilities	172	172
Other accrued liabilities	197	196
Current portion of long-term debt	125	125
Long-term debt, net of current portion	360	360
Deferred income taxes	(307)	(304)
Deferred revenue	126	126
Other liabilities	97	82
Total liabilities	846	830
Total purchase price	$ 2,596	$ 2,596