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LONG-TERM DEBT (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Long-term debt obligations on the condensed consolidated balance sheet (in millions):
 June 30, 2021December 31, 2020
Fixed-rate notes payable due through 2029$180 $198 
Fixed-rate PSP notes payable due through 2031600 290 
Fixed-rate EETC payable due through 2025 & 20271,116 1,174 
Variable-rate notes payable due through 20291,315 1,866 
Less debt issuance costs and unamortized debt discount(23)(33)
Total debt3,188 3,495 
Less current portion869 1,138 
Long-term debt, less current portion$2,319 $2,357 
Weighted-average fixed-interest rate3.7 %4.3 %
Weighted-average variable-interest rate1.6 %1.9 %
Schedule of Maturities of Long-term Debt At June 30, 2021 long-term debt principal payments for the next five years and thereafter are as follows (in millions):
 Total
Remainder of 2021$227 
2022796 
2023334 
2024240 
2025261 
Thereafter1,353 
Total$3,211