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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) airline | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |
Number of airline partners | airline | 16 |  |
Breakage rate | 17.40% | 17.40% |
Air traffic liability | $ 1,122 |  | $ 806
Receivable | 350 |  | 341
Contract cost recognized | 51 | $ 56 |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract costs | 29 |  | 24
Mileage Plan Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Receivable | 101 |  | $ 101
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract liability revenue recognized | (19) | (23) |
Passenger Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract liability revenue recognized | $ 434 | $ 431 |

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