Liabilities, Commitments and Contingencies - Schedule of 737 Max Customer Concessions and Other Considerations Liability (Details) - 737 Aircraft - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Customer Concession And Other Consideration Liability [Roll Forward]
Beginning balance – January 1	$ 383	$ 641
Reductions for payments made	(10)	(38)
Reductions for concessions and other in-kind considerations		(35)
Changes in estimates
Ending balance – March 31	$ 373	$ 568