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Inventories - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Inventory [Line Items]        
777X and 767 reach-forward losses   $ 5,140 $ 3,006  
Early Issue Sales Consideration        
Inventory [Line Items]        
Inventory subject to uncertainty $ 6,070 6,070   $ 5,837
Airplane Program 737        
Inventory [Line Items]        
Amount of deferred costs related to commercial aircraft programs 11,082 11,082   9,679
Unamortized tooling and other non-recurring costs 828 828   909
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date 11,871 11,871    
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders 39 39    
Airplane Program 777x        
Inventory [Line Items]        
Amount of deferred costs related to commercial aircraft programs 0 0   0
Unamortized tooling and other non-recurring costs 1,486 1,486   4,122
Inventory, work in process 3,697 3,697   3,476
777X and 767 reach-forward losses 4,899      
Airplane Program 787        
Inventory [Line Items]        
Amount of deferred costs related to commercial aircraft programs 14,088 14,088   13,178
Unamortized tooling and other non-recurring costs 1,246 1,246   1,370
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date 12,597 12,597    
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders 2,737 2,737    
Supplier advances $ 1,100 1,100   $ 1,379
Abnormal production costs   $ 30 $ 209