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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Firm Commitments and Options to Purchase Aircraft and Summary of Commitments As of March 31, 2023, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
Scheduled Aircraft Deliveries
Aircraft TypeNumber of Firm
 Commitments (a)		Last Nine Months
of 2023		2024After 2024
787100 — 8 92 
737 MAX412 114 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 March 31, 2023, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments. Aircraft commitments are based on contractual scheduled aircraft deliveries without any adjustments for the delays communicated by Boeing and Airbus or estimated by United.
(in billions)
Last nine months of 2023$8.3 
20248.1 
20258.3 
20265.9 
20274.7 
After 202716.8 
$52.1 
Summary Of Estimated Future payments Of Contractual Obligation Based on these assumptions as of March 31, 2023, our estimated future payments through the end of the terms of our CPAs are presented in the table below:
(in billions)
Last nine months of 2023$1.7 
20242.1 
20251.8 
20261.6 
20271.1 
After 20273.9 
$12.2