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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block] | Future minimum fixed payments for commitments as of December 31, 2015 (in millions):
| Aircraft Leases |  | Facility Leases |  | Aircraft Commitments |  | Capacity Purchase Agreements
2016 | $ | 113 |  |  | $ | 92 |  |  | $ | 505 |  |  | $ | 67 |
2017 | 104 |  |  | 88 |  |  | 549 |  |  | 58 |
2018 | 98 |  |  | 41 |  |  | 444 |  |  | 60 |
2019 | 90 |  |  | 41 |  |  | 390 |  |  | 64 |
2020 | 81 |  |  | 38 |  |  | 327 |  |  | 68 |
Thereafter | 467 |  |  | 142 |  |  | 418 |  |  | 554 |
Total | $ | 953 |  |  | $ | 442 |  |  | $ | 2,633 |  |  | $ | 871 |

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