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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - MAINTENANCE DEPOSITS (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]    
Aircraft Maintenance Deposits $ 70 $ 140
Lease Return Provision, Current $ (112) (186)
Lease Return Provision, Non-Current   $ (91)