ACQUISITION OF VIRGIN AMERICA, INC. Fair value of consideration transferred (Details) - Virgin America Inc. [Member] $ / shares in Units, shares in Thousands, $ in Millions	Dec. 14, 2016 USD ($) $ / shares shares
Business Acquisition [Line Items]
Number of shares of Virgin America common stock issued and outstanding | shares	44,645
Multiplied by cash consideration for each share of common stock per the merger agreement | $ / shares	$ 57.00
Cash consideration paid for common stock issued and outstanding	$ 2,545
Accelerated and vested equity awards attributable to pre-acquisition service	51
Total Purchase Price	$ 2,596