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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Summary of Commitments to Purchase Aircraft As of December 31, 2020 (adjusted to include the effects of the February 26, 2021 agreement with The Boeing Company ("Boeing") discussed below), United had firm commitments and options to purchase aircraft from Boeing, Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") presented in the table below:
Scheduled Aircraft Deliveries
Aircraft TypeNumber of Firm
Commitments (a)		20212022After 2022
Airbus A321XLR50 — — 50 
Airbus A35045 — — 45 
Boeing 737 MAX188 21 40 127 
Boeing 78711 11 — — 
Embraer E1754 4 — — 
(a) United also has options and purchase rights for additional aircraft.
The table below summarizes United's commitments as of December 31, 2020 (adjusted to include the effects of the February 26, 2021 agreement with Boeing), which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
2021$4.9 
20222.9 
20232.8 
20241.6 
20252.0 
After 202510.1 
$24.3