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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | Long-term debt obligations on the consolidated balance sheet (in millions):
| 2023 |  | 2022
Fixed-rate notes payable due through 2029 | $ | 80 |  |  | $ | 113 |
Fixed-rate PSP note payable due through 2031 | 600 |  |  | 600 |
Fixed-rate EETC payable due through 2025 & 2027 | 835 |  |  | 947 |
Variable-rate notes payable due through 2035 | 971 |  |  | 514 |
Less debt issuance costs | (15) |  |  | (15) |
Total debt | 2,471 |  |  | 2,159 |
Less current portion(a) | 289 |  |  | 276 |
Long-term debt, less current portion | $ | 2,182 |  |  | $ | 1,883 |
Weighted-average fixed-interest rate | 3.4 | % |  | 3.5 | %
Weighted-average variable-interest rate | 6.8 | % |  | 5.8 | %
Schedule of Maturities of Long-term Debt [Table Text Block] | At December 31, 2023, long-term debt principal payments for the next five years and thereafter are as follows (in millions):
| Total
2024 | $ | 294 |
2025 | 351 |
2026 | 307 |
2027 | 630 |
2028 | 114 |
Thereafter | 790 |
Total Principal Payments | $ | 2,486 |

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