Inventories (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) aircraft	Dec. 31, 2016 USD ($)
Inventories [Line Items]
Progress Payments Netted Against Inventory for Long-term Contracts or Programs		$ 28,094	$ 27,096
Inventory Write-down	$ 1,235
Commercial spare parts, used aircraft, general stock materials and other		5,688	5,446
Airplane Program 787 [Member]
Inventories [Line Items]
Inventory, work in process		30,695	32,501
Deferred production costs		25,358	27,308
Supplier advances		3,189	2,398
Unamortized tooling and other non-recurring costs		3,173	3,625
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date		22,220
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders		6,311
Airplane Program 747 [Member]
Inventories [Line Items]
Unamortized tooling and other non-recurring costs		151	284
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date		$ 146
Unsold Aircraft | aircraft		1
ULA [Member]
Inventories [Line Items]
Inventory subject to uncertainty		$ 120
Progress Payments Netted Against Inventory for Long-term Contracts or Programs		164	220
Capitalized Precontract Costs [Member]
Inventories [Line Items]
Inventory subject to uncertainty		933	729
Early Issue Sales Consideration [Member]
Inventories [Line Items]
Inventory subject to uncertainty		$ 2,976	$ 3,117