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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block]
Future minimum payments for commitments as of December 31, 2019 (in millions):
 
Aircraft Commitments(a)
Capacity Purchase Agreements(b)
Aircraft Maintenance Deposits
2020$531  $145  $73  
2021487  166  62  
2022347  174  51  
2023206  179  26  
202431  184  6  
Thereafter26  880  2  
Total$1,628  $1,728  $220