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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
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):
20212020
Fuel hedge contracts (not designated as hedges)
Prepaid expenses and other current assets$71 $11 
Other assets10 4 
Interest rate swaps (designated as hedges)
Other accrued liabilities(6)(10)
Other liabilities(3)(15)
Gains (losses) in accumulated other comprehensive loss (AOCL)17 (21)
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):
202120202019
Fuel hedge contracts (not designated as hedges)
Gains (losses) recognized in Aircraft fuel$104 $(10)$(10)
Interest rate swaps (designated as hedges)
Losses recognized in Aircraft rent— (3)(3)
Gains (losses) recognized in other comprehensive income (OCI)17 (21)(13)