Inventories (Narrative) (Details) $ in Millions	Dec. 31, 2018 USD ($) aircraft	Dec. 31, 2017 USD ($)
Inventories [Line Items]
Long-term contracts in progress	$ 2,129	$ 1,854
Commercial spare parts, used aircraft, general stock materials and other	7,685	6,673
Airplane Program 787 [Member]
Inventories [Line Items]
Inventory, work in process	27,852	30,695
Deferred production costs	22,967	25,358
Supplier advances	2,453	3,189
Unamortized tooling and other non-recurring costs	2,638	3,173
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	17,320
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	8,285
Airplane Program 747 [Member]
Inventories [Line Items]
Unamortized tooling and other non-recurring costs	116	151
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	$ 111
Unsold Aircraft | aircraft	1
Capitalized Precontract Costs [Member]
Inventories [Line Items]
Inventory subject to uncertainty	$ 644	933
Early Issue Sales Consideration [Member]
Inventories [Line Items]
Inventory subject to uncertainty	$ 2,844	$ 2,976