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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | Long-term debt obligations (in millions):
| 2020 |  | 2019
Fixed-rate notes payable due through 2029 | $ | 198 |  |  | $ | 475 |
Fixed-rate PSP note payable due through 2030 | 290 |  |  | — |
Fixed-rate EETC payable due through 2025 & 2027 | 1,174 |  |  | — |
Variable-rate notes payable due through 2029 | 1,866 |  |  | 1,032 |
Less debt issuance costs and unamortized debt discount | (33) |  |  | (8) |
Total debt | 3,495 |  |  | 1,499 |
Less current portion | 1,138 |  |  | 235 |
Long-term debt, less current portion | $ | 2,357 |  |  | $ | 1,264 |
Weighted-average fixed-interest rate | 4.3 | % |  | 3.3 | %
Weighted-average variable-interest rate | 1.9 | % |  | 2.9 | %
Schedule of Maturities of Long-term Debt [Table Text Block] | Long-term debt principal payments for the next five years and thereafter (in millions):
| Total
2021 | $ | 1,145 |
2022 | 371 |
2023 | 334 |
2024 | 240 |
2025 | 396 |
Thereafter | 1,042 |
Total principal payments | $ | 3,528 |

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