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COMMITMENTS (Tables) | 9 Months Ended
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Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions | Future minimum fixed payments for commitments (in millions):
September 30, 2016 | Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements (a)
Remainder of 2016 | $ | 20 |  |  | $ | 24 |  |  | $ | 146 |  |  | $ | 17 |
2017 | 99 |  |  | 91 |  |  | 931 |  |  | 78 |
2018 | 90 |  |  | 43 |  |  | 724 |  |  | 81 |
2019 | 82 |  |  | 43 |  |  | 645 |  |  | 86 |
2020 | 73 |  |  | 40 |  |  | 334 |  |  | 92 |
Thereafter | 400 |  |  | 188 |  |  | 397 |  |  | 746 |
Total | $ | 764 |  |  | $ | 429 |  |  | $ | 3,177 |  |  | $ | 1,100 |

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