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Liabilities, Commitments and Contingencies - Schedule of 737 Max Customer Concessions and Other Considerations Liability (Details) - B-737 - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Customer Concession And Other Consideration Liability [Roll Forward]    
Beginning balance – January 1 $ 641 $ 1,327
Reductions for payments made (135) (767)
Reductions for concessions and other in-kind considerations (66) (256)
Changes in estimates (5) 510
Ending balance – September 30 $ 435 $ 814