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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Firm Commitments and Options to Purchase Aircraft and Summary of Commitments As of December 31, 2022, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") presented in the table below:
Scheduled Aircraft Deliveries
Aircraft TypeNumber of Firm
 Commitments (a)		20232024After 2024
787102 2 8 92 
737 MAX433 135 88 210 
A321neo70 12 31 27 
A321XLR50 — — 50 
A35045 — — 45 
(a) United also has options and purchase rights for additional aircraft.
Summary of Commitments The table below summarizes United's commitments as of December 31, 2022, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
2023$10.2 
20248.0 
20257.8 
20265.9 
20275.0 
After 202716.6 
$53.5