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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 (in millions):
| Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements |  | Aircraft Maintenance Deposits |  | Aircraft Maintenance and Parts Management
2017 | $ | 302 |  |  | $ | 123 |  |  | $ | 926 |  |  | $ | 76 |  |  | $ | 59 |  |  | $ | 30 |
2018 | 316 |  |  | 73 |  |  | 848 |  |  | 80 |  |  | 61 |  |  | 32 |
2019 | 305 |  |  | 63 |  |  | 694 |  |  | 85 |  |  | 65 |  |  | 35 |
2020 | 279 |  |  | 57 |  |  | 354 |  |  | 90 |  |  | 68 |  |  | 37 |
2021 | 242 |  |  | 50 |  |  | 277 |  |  | 94 |  |  | 63 |  |  | 40 |
Thereafter | 953 |  |  | 171 |  |  | 361 |  |  | 676 |  |  | 90 |  |  | — |
Total | $ | 2,397 |  |  | $ | 537 |  |  | $ | 3,460 |  |  | $ | 1,101 |  |  | $ | 406 |  |  | $ | 174 |

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