Inventory (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended								3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 B747	Dec. 31, 2011 B747	Dec. 31, 2012 B767	Dec. 31, 2012 B767	Dec. 31, 2012 B787	Sep. 27, 2012 B787	Dec. 31, 2011 B787	Dec. 31, 2012 A350 XWB	Dec. 31, 2011 A350 XWB	Dec. 31, 2012 Airbus - All Platforms	Dec. 31, 2011 Airbus - All Platforms	Sep. 27, 2012 Rolls-Royce	Dec. 31, 2012 Rolls-Royce	Dec. 31, 2011 Rolls-Royce	Dec. 31, 2012 Aftermarket	Dec. 31, 2011 Aftermarket	Dec. 31, 2012 Other Platforms	Dec. 31, 2011 Other Platforms	Dec. 31, 2012 G280 [Member]	Dec. 31, 2011 G280 [Member]	Dec. 31, 2012 G650 [Member]	Sep. 27, 2012 G650 [Member]	Dec. 31, 2011 G650 [Member]	Dec. 31, 2012 Sikorsky [Member]	Dec. 31, 2011 Sikorsky [Member]	Sep. 29, 2011 Sikorsky [Member]	Mar. 31, 2011 Sikorsky [Member]	Dec. 31, 2012 Boeing Sustaining [Member]	Dec. 31, 2011 Boeing Sustaining [Member]
Inventory By Platform [Abstract]
Inventory	$ 2,410.8	$ 2,630.9		$ 82.2	$ 136.9			$ 852.4		$ 971.1	$ 409.8	$ 174.2	$ 106.4	$ 95.5			$ 95.6	$ 45.0	$ 43.1	$ 106.5	$ 58.1	$ 68.3	$ 80.1	$ 379.9		$ 501.1	$ 4.7	$ 17.5			$ 355.6	$ 457.7
Inventory In Process	1,202.3	1,155.4		83.6	88.8			225.2		210.3	133.2	96.6	88.2	84.0		12.6	12.1	45.0	43.1	102.2	56.3	83.3	42.9	36.7		93.1					392.3	428.2
Non Recurring Production Costs Included In Inventory [Abstract]
Nonrecurring production cost included in inventory	117.5	109.1		(0.7)	10.8			26.6		17.1	51.3	41.4								4.0	1.8						4.7	17.5			31.6	20.5
Reclassification Of Inventory From NonRecurring To Capitalized Preproduction																	58.0
Capitalized Preproduction Costs Included In Inventory [Abstract]
Total capitalized pre-production	524.6	553.2	541.8	7.2	5.5			189.5		210.5	56.8	36.2				51.4	58.0					5.5		208.4		240.9					5.8	2.1
Reclassification Of Inventory From NonRecurring To Capitalized Preproduction																	58.0
Net Forward Loss Charge Recorded	644.7					8.0	8.0								151.0	151.0
Provision for Loss on Contracts	607.4	227.9		11.5	18.3			184.0	184.0		8.9	3.0				115.2						118.8	177.6	162.5	162.5			29.0	10.0	28.2	6.5
Deferred Production Costs And Credit Balances [Abstract
Deferred Production Costs	1,173.8	813.2	760.0	3.6	31.8			595.1		533.2	177.4		18.2	11.5		51.2	25.5			0.3		98.3	37.2	297.3		167.1					(67.6)	6.9
Contract Liability						$ 1.5	$ 1.5									$ 35.8