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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt obligations (in millions):
 20202019
Fixed-rate notes payable due through 2029$198 $475 
Fixed-rate PSP note payable due through 2030290 — 
Fixed-rate EETC payable due through 2025 & 20271,174 — 
Variable-rate notes payable due through 20291,866 1,032 
Less debt issuance costs and unamortized debt discount(33)(8)
Total debt3,495 1,499 
Less current portion1,138 235 
Long-term debt, less current portion$2,357 $1,264 
Weighted-average fixed-interest rate4.3 %3.3 %
Weighted-average variable-interest rate1.9 %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 
2022371 
2023334 
2024240 
2025396 
Thereafter1,042 
Total principal payments$3,528