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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Firm Commitments and Options to Purchase Aircraft and Summary of Commitments As of September 30, 2023, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
Contractual Aircraft DeliveriesExpected Aircraft Deliveries (b)
Aircraft TypeNumber of Firm
 Commitments (a)		Last Three Months
of 2023		2024After 2024Last Three Months
of 2023		2024After 2024
787150 — 8 142 — 8 142 
737 MAX374 73 100 201 20 77 277 
A321neo130 4 26 100 4 26 100 
A321XLR50 — — 50 — — 50 
A35045 — — 45 — — 45 
(a) United also has options and purchase rights for additional aircraft.
(b) Expected aircraft deliveries reflect adjustments communicated by Boeing and Airbus or estimated by United.
Schedule of Commitments
The table below summarizes United's firm commitments as of September 30, 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 communicated by Boeing and Airbus or estimated by United.
(in billions)
Last three months of 2023$4.6 
20248.8 
20258.0 
20266.1 
20275.0 
After 202729.6 
$62.1 
Schedule of Estimated Future payments of Contractual Obligation Based on these assumptions as of September 30, 2023, our estimated future payments through the end of the terms of our CPAs are presented in the table below:
(in billions)
Last three months of 2023$0.6 
20242.2 
20251.9 
20262.1 
20271.6 
After 20275.7 
$14.1