Inventories - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Inventories [Line Items]
777X and 767 reach-forward losses	$ 5,283	$ 4,079
Early Issue Sales Consideration
Inventories [Line Items]
Inventory subject to uncertainty	6,412	5,837
Airplane Program 737
Inventories [Line Items]
Deferred production costs	11,777	9,679
Unamortized tooling and other non-recurring costs	750	909
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	12,490
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	37
Airplane Program 777x
Inventories [Line Items]
Deferred production costs	651	0
Unamortized tooling and other non-recurring costs	1,816	4,122
Inventory, work in process	4,313	3,476
Abnormal production costs	0	0	513
777X and 767 reach-forward losses	4,899	3,499
Airplane Program 787
Inventories [Line Items]
Deferred production costs	13,859	13,178
Unamortized tooling and other non-recurring costs	1,366	1,370
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	13,027
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	2,198
Abnormal production costs	30	256	$ 1,014
Supplier advances	$ 932	$ 1,379