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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Commitments to Purchase Aircraft As of December 31, 2021, United had firm commitments and options 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)		20222023After 2023
Airbus A321XLR50 — — 50 
Airbus A321neo70 — 12 58 
Airbus A35045 — — 45 
Boeing 737 MAX367 53 109 205 
Boeing 7878 8 — — 
(a) United also has options and purchase rights for additional aircraft.
The table below summarizes United's commitments as of December 31, 2021, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
2022$5.7 
20236.9 
20245.0 
20254.3 
20263.3 
After 20268.9 
$34.1