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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block] | Future minimum payments for commitments as of December 31, 2017 (in millions):
| Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements (a) |  | Aircraft Maintenance Deposits |  | Aircraft Maintenance and Parts Management
2018 | $ | 354 |  |  | $ | 77 |  |  | $ | 955 |  |  | $ | 129 |  |  | $ | 61 |  |  | $ | 98 |
2019 | 356 |  |  | 67 |  |  | 816 |  |  | 151 |  |  | 65 |  |  | 102 |
2020 | 330 |  |  | 61 |  |  | 377 |  |  | 159 |  |  | 68 |  |  | 105 |
2021 | 285 |  |  | 53 |  |  | 268 |  |  | 165 |  |  | 64 |  |  | 121 |
2022 | 262 |  |  | 34 |  |  | 193 |  |  | 173 |  |  | 52 |  |  | 76 |
Thereafter | 1,021 |  |  | 142 |  |  | 145 |  |  | 1,079 |  |  | 39 |  |  | 80 |
Total | $ | 2,608 |  |  | $ | 434 |  |  | $ | 2,754 |  |  | $ | 1,856 |  |  | $ | 349 |  |  | $ | 582 |

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