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LONG-TERM DEBT (Tables)
 12 Months Ended
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):
 20212020
Fixed-rate notes payable due through 2029$163 $198 
Fixed-rate PSP note payable due through 2031600 290 
Fixed-rate EETC payable due through 2025 & 20271,058 1,174 
Variable-rate notes payable due through 2029738 1,866 
Less debt issuance costs and unamortized debt discount(20)(33)
Total debt2,539 3,495 
Less current portion366 1,138 
Long-term debt, less current portion$2,173 $2,357 
Weighted-average fixed-interest rate3.7 %4.3 %
Weighted-average variable-interest rate1.3 %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 
2023334 
2024240 
2025261 
2026176 
Thereafter1,177 
Total principal payments$2,559