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LONG-TERM DEBT (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Long-term debt obligations on the condensed consolidated balance sheet (in millions):
 March 31, 2022December 31, 2021
Fixed-rate notes payable due through 2029$150 $163 
Fixed-rate PSP notes payable due through 2031600 600 
Fixed-rate EETC payable due through 2025 & 20271,002 1,058 
Variable-rate notes payable due through 2029636 738 
Less debt issuance costs (18)(20)
Total debt2,370 2,539 
Less current portion292 366 
Long-term debt, less current portion$2,078 $2,173 
Weighted-average fixed-interest rate3.6 %3.7 %
Weighted-average variable-interest rate1.7 %1.3 %
Schedule of Maturities of Long-term Debt At March 31, 2022, long-term debt principal payments for the next five years and thereafter are as follows (in millions):
 Total
Remainder of 2022$201 
2023334 
2024240 
2025261 
2026176 
Thereafter1,176 
Total$2,388