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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 (in millions):
|  | Aircraft Commitments(a) |  | Capacity Purchase Agreements(b)
2021 |  | $ | 873 |  |  | $ | 166 |
2022 |  | 372 |  |  | 174 |
2023 |  | 238 |  |  | 179 |
2024 |  | 27 |  |  | 184 |
2025 |  | 16 |  |  | 189 |
Thereafter |  | 13 |  |  | 690 |
Total |  | $ | 1,539 |  |  | $ | 1,582 |

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