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LONG-TERM DEBT LONG-TERM DEBT - SECURED DEBT (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 01, 2016 USD ($) aircraft | Sep. 30, 2016 USD ($) agreement aircraft | Sep. 30, 2016 USD ($) agreement aircraft | Sep. 30, 2015 USD ($) | Oct. 11, 2016 aircraft
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt, Number of Aircrafts Securing Debt Financing |  | 53 | 53 |  |
Repayments of Long-term Debt | $ |  |  | $ 93 | $ 93 |
Secured by aircraft [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Secured Debt | $ |  | $ 1,500 |  |  |
Interest rate swaps agreements [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, Amount of Hedged Item | $ |  | $ 300 | $ 300 |  |
Derivative, Number of Instruments Held | agreement |  | 2 | 2 |  |
Subsequent Event [Member] | Secured by aircraft [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Secured Debt | $ | $ 100 |  |  |  |
Boeing, 737-900ER [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt, Number of Aircrafts Securing Debt Financing |  | 34 | 34 |  |
Boeing, 737-900ER [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt, Number of Aircrafts Securing Debt Financing | 3 |  |  |  |
Committed to Purchase (in Aircraft) |  |  |  |  | 19
B-737-800 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt, Number of Aircrafts Securing Debt Financing |  | 19 | 19 |  |

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