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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Fair values of derivative instruments on the consolidated balance sheet (in millions):
20222021
Fuel hedge contracts (not designated as hedges)
Other current assets$33 $71 
Other assets11 10 
Interest rate swaps (designated as hedges)
Other current assets8 — 
Other noncurrent assets7 — 
Other accrued liabilities— (6)
Other liabilities— (3)
Gains (losses) in accumulated other comprehensive loss (AOCL)23 17 
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] Pretax effect of derivative instruments on earnings and AOCL (in millions):
202220212020
Fuel hedge contracts (not designated as hedges)
Gains (losses) recognized in Aircraft fuel$93 $104 $(10)
Interest rate swaps (designated as hedges)
Losses recognized in Aircraft rent— — (3)
Gains (losses) recognized in other comprehensive income (OCI)23 17 (21)