Inventories - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Early Issue Sales Consideration
Inventory [Line Items]
Inventory subject to uncertainty	$ 6,590	$ 6,412
Airplane Program 737
Inventory [Line Items]
Amount of deferred costs related to commercial aircraft programs	12,549	11,777
Unamortized tooling and other non-recurring costs	735	750
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	13,243
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	41
Airplane Program 777x
Inventory [Line Items]
Amount of deferred costs related to commercial aircraft programs	1,104	651
Unamortized tooling and other non-recurring costs	1,995	1,816
Inventory, work in process	5,296	4,313
Airplane Program 787
Inventory [Line Items]
Amount of deferred costs related to commercial aircraft programs	14,310	13,859
Unamortized tooling and other non-recurring costs	1,348	1,366
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	13,403
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	2,255
Supplier advances	$ 921	$ 932