Inventory (Details 1) (USD $) In Millions, unless otherwise specified			3 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended					3 Months Ended	9 Months Ended						3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Jun. 27, 2013	Dec. 31, 2012	Jun. 27, 2013 Inventory Type Two [Member]	Dec. 31, 2012 Inventory Type Two [Member]	Jun. 27, 2013 Inventory Type Three [Member]	Dec. 31, 2012 Inventory Type Three [Member]	Jun. 27, 2013 Inventory Type Five [Member]	Jun. 27, 2013 Inventory Type Five [Member]	Dec. 31, 2012 Inventory Type Five [Member]	Dec. 31, 2011 Airbus Three Hundred Fifty XWB [Member]	Jun. 27, 2013 Airbus Three Hundred Fifty XWB [Member]	Dec. 31, 2012 Airbus Three Hundred Fifty XWB [Member]	Jun. 27, 2013 Inventory Type Six [Member]	Dec. 31, 2012 Inventory Type Six [Member]	Jun. 27, 2013 Inventory Type Eight [Member]	Sep. 27, 2012 Inventory Type Eight [Member]	Dec. 31, 2012 Inventory Type Eight [Member]	Jun. 27, 2013 Inventory Type Ten [Member]	Dec. 31, 2012 Inventory Type Ten [Member]	Jun. 27, 2013 Other Inventory Contracts [Member]	Dec. 31, 2012 Other Inventory Contracts [Member]	Jun. 27, 2013 G280 [Member]	Dec. 31, 2011 G280 [Member]	Dec. 31, 2012 G280 [Member]	Jun. 27, 2013 G650 [Member]	Dec. 31, 2012 G650 [Member]	Dec. 31, 2011 Sikorsky [Member]	Jun. 27, 2013 Sikorsky [Member]	Dec. 31, 2012 Sikorsky [Member]	Jun. 27, 2013 Boeing Sustaining [Member]	Dec. 31, 2012 Boeing Sustaining [Member]	Jun. 27, 2013 Bombardier C Series [Member]	Dec. 31, 2012 Bombardier C Series [Member]
Inventory By Platform [Abstract]
Inventory	$ 2,187.0	$ 2,410.8	$ 100.4	$ 82.2			$ 798.9	$ 798.9	$ 852.4		$ 521.1	$ 409.8	$ 86.6	$ 106.4				$ 57.1	$ 45.0	$ 22.1	$ 102.3			$ 68.3	$ 211.0	$ 379.9		$ 1.9	$ 4.7	$ 382.5	$ 355.6	$ 5.4	$ 4.2
Inventory In Process	1,211.5	1,202.3	95.7	83.6			241.9	241.9	225.2		137.4	133.2	79.5	88.2	19.3		12.6	57.1	45.0	18.1	98.3	75.4		83.3	70.3	36.7				411.8	392.3	5.0	3.9
Non Recurring Production Costs Included In Inventory [Abstract]
Nonrecurring production cost included in inventory	88.1	117.5		(0.7)			(0.3)	(0.3)	26.6		60.6	51.3								4.0	4.0							1.9	4.7	21.9	31.6
Capitalized Preproduction Costs Included In Inventory [Abstract]
Capitalized pre-production	515.0	524.6	6.1				174.7	174.7	189.5		73.1	56.8			47.3		51.4					5.2		5.5	201.2	208.4				7.4	5.8
Net Forward Loss Charge Recorded			5.0		4.0	8.0	22.0	37.3		11.6					(8.4)	151.0						191.5	423.7		234.2		29.0
Provision for Loss on Contracts	1,015.3	607.4	(5.0)	(11.5)			(221.3)	(221.3)	(184.0)		(8.6)	(8.9)			(125.6)		(115.2)					(246.1)		(118.8)	(396.7)	(162.5)				(12.0)	(6.5)
Deferred Production Costs And Credit Balances [Abstract]
Deferred Production Costs	1,387.7	1,173.8	3.6	3.6			603.9	603.9	595.1		258.6	177.4	7.1	18.2	59.0		51.2					165.5		98.3	336.2	297.3				(46.6)	(67.6)	0.4	0.3
Contract Liability						$ 1.5									$ 17.0		$ 27.4