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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - MAINTENANCE DEPOSITS (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Aircraft Maintenance Deposits $ 175 $ 242
Lease Return Provision, Current (53) 54
Lease Return Provision, Non-Current $ (114) $ 246