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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | Long-term debt obligations on the consolidated balance sheet (in millions):
| 2021 |  | 2020
Fixed-rate notes payable due through 2029 | $ | 163 |  |  | $ | 198 |
Fixed-rate PSP note payable due through 2031 | 600 |  |  | 290 |
Fixed-rate EETC payable due through 2025 & 2027 | 1,058 |  |  | 1,174 |
Variable-rate notes payable due through 2029 | 738 |  |  | 1,866 |
Less debt issuance costs and unamortized debt discount | (20) |  |  | (33) |
Total debt | 2,539 |  |  | 3,495 |
Less current portion | 366 |  |  | 1,138 |
Long-term debt, less current portion | $ | 2,173 |  |  | $ | 2,357 |
Weighted-average fixed-interest rate | 3.7 | % |  | 4.3 | %
Weighted-average variable-interest rate | 1.3 | % |  | 1.9 | %
Schedule of Maturities of Long-term Debt [Table Text Block] | ong-term debt principal payments for the next five years and thereafter are as follows (in millions):
| Total
2022 | $ | 371 |
2023 | 334 |
2024 | 240 |
2025 | 261 |
2026 | 176 |
Thereafter | 1,177 |
Total principal payments | $ | 2,559 |

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