Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Inventories [Line Items]
Progress Payments Netted Against Inventory for Long-term Contracts or Programs		$ 27,096	$ 28,504
Inventory Write-down	$ 1,235
Commercial spare parts, used aircraft, general stock materials and other		5,446	6,673
Airplane Program 787 [Member]
Inventories [Line Items]
Inventory, work in process		32,501	34,656
Deferred production costs		27,308	28,510
Supplier advances		2,398	2,551
Unamortized tooling and other non-recurring costs		3,625	3,890
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date		23,818
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders		7,115
Airplane Program 747 [Member]
Inventories [Line Items]
Deferred production costs		35	942
Unamortized tooling and other non-recurring costs		284	377
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date		233
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders		86
ULA [Member]
Inventories [Line Items]
Inventory subject to uncertainty		120	120
Progress Payments Netted Against Inventory for Long-term Contracts or Programs		220	310
Capitalized Precontract Costs [Member]
Inventories [Line Items]
Inventory subject to uncertainty		729	732
Deferred production costs [Member]
Inventories [Line Items]
Inventory Write-down	$ 1,011
Early Issue Sales Consideration [Member]
Inventories [Line Items]
Inventory subject to uncertainty		3,117	3,166
Used Aircraft [Member]
Inventories [Line Items]
Commercial spare parts, used aircraft, general stock materials and other		$ 150	$ 267