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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block] Long-term debt obligations on the consolidated balance sheet (in millions):
 20222021
Fixed-rate notes payable due through 2029$113 $163 
Fixed-rate PSP note payable due through 2031600 600 
Fixed-rate EETC payable due through 2025 & 2027947 1,058 
Variable-rate notes payable due through 2029514 738 
Less debt issuance costs(15)(20)
Total debt2,159 2,539 
Less current portion276 366 
Long-term debt, less current portion$1,883 $2,173 
Weighted-average fixed-interest rate3.5 %3.7 %
Weighted-average variable-interest rate5.8 %1.3 %
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
2023$280 
2024244 
2025296 
2026176 
2027535 
Thereafter643 
Total principal payments$2,174