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LONG-TERM DEBT LONG-TERM DEBT - SECURED DEBT (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) aircraft | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |
Debt instrument, increase (decrease) | $ (395) |  |
Secured debt, number of aircrafts securing debt financing | aircraft | 113 |  |
Long-term Debt | $ 2,569 | $ 2,964 |
Secured Debt, Number of Spare Engines Securing Debt Financing | aircraft | 2 |  |
Long-term debt payments | $ 397 | $ 249 | $ 116
Repayments of debt | 74 |  |
Secured Debt [Member] | Secured Debt, Aircraft Collateral [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 2,200 |  |
Secured Debt [Member] | Secured Debt, Aircraft Purchase Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 392 |  |

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- Definition Secured Debt, Number of Spare Engines Securing Debt Financing + References No definition available. + Details
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- Definition Net increase or decrease in the carrying amount of the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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