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PROPOSED ACQUISITION OF VIRGIN AMERICA INC. (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Special items - merger costs |  | $ 14 | $ 0 | $ 14 | $ 0
Virgin America Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Approximate Acquisition purchase price | $ 2,600 |  |  |  |
Virgin America Inc. [Member] | Common Stock [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition share price | $ 57 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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