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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 (in millions):
|  | Aircraft Commitments(a) |  | Capacity Purchase Agreements(b)
2022 |  | $ | 1,339 |  |  | $ | 173 |
2023 |  | 1,686 |  |  | 178 |
2024 |  | 389 |  |  | 183 |
2025 |  | 79 |  |  | 188 |
2026 |  | 13 |  |  | 189 |
Thereafter |  | — |  |  | 688 |
Total |  | $ | 3,506 |  |  | $ | 1,599 |

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