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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) airline | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Number of airline partners | airline |  |  | 16 |  |
Breakage rate | 17.40% | 17.40% | 17.40% | 17.40% |
Air traffic liability | $ 1,112 |  | $ 1,112 |  | $ 806
Receivable | 411 |  | 411 |  | 341
Contract cost recognized | 58 | $ 66 | 109 | $ 122 |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract costs | 31 |  | 31 |  | 24
Mileage Plan Revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Receivable | 103 |  | 103 |  | $ 101
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract liability revenue recognized |  |  | (44) | (44) |
Passenger Revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract liability revenue recognized | $ 79 | $ 89 | $ 513 | $ 520 |

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