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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Cargo and other revenue included in the condensed consolidated statements of operations for the three months ended March 31, 2018 and 2017 (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Cargo revenue | $ | 26 |  |  | $ | 24 |
Other revenue | 14 |  |  | 14 |
Total Cargo and other revenue | $ | 40 |  |  | $ | 38 |
Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 1,428 |  |  | $ | 1,358 |
Passenger ancillary revenue | 118 |  |  | 116 |
Mileage Plan TM passenger revenue | 139 |  |  | 128 |
Total passenger revenue | $ | 1,685 |  |  | $ | 1,602 |
Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Passenger revenue | $ | 139 |  |  | $ | 128 |
Mileage Plan TM other revenue | 107 |  |  | 100 |
Total Mileage Plan™ revenue | $ | 246 |  |  | $ | 228 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Total Deferred Revenue balance at January 1 | $ | 1,726 |  |  | $ | 1,535 |
Travel miles and companion certificate redemption - Passenger revenue | (139 | ) |  | (128 | )
Miles redeemed on partner airlines - Other revenue | (19 | ) |  | (23 | )
Increase in liability for mileage credits issued | 183 |  |  | 185 |
Total Deferred Revenue balance at March 31 | $ | 1,751 |  |  | $ | 1,569 |

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