Advance Payments and Deferred Revenue/Credits (Details) $ in Millions	9 Months Ended
	Sep. 28, 2017 USD ($) pure / $	Sep. 29, 2016 USD ($)	Dec. 31, 2016 USD ($)
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	$ 621.4		$ 1,000.2
Increase (Decrease) in Customer Advances	154.7	$ 101.8
B737 [Member]
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	9.6		18.6
B787 [Member]
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	549.8		834.8
Increase (Decrease) in Customer Advances	235.0
Airbus Three Hundred Fifty XWB [Member]
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	34.5		116.7
Airbus - All other platforms [Member]
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	1.6		2.2
Other Inventory [Member]
Advance payments and deferred revenue/credits summarized
Advance Payments And Deferred Revenue Credits	$ 25.9		$ 27.9
Minimum [Member]
Advance payments and deferred revenue/credits summarized
Boeing Advance Payment ShipSet	1,001
Maximum [Member]
Advance payments and deferred revenue/credits summarized
Boeing Advance Payment ShipSet	1,120