Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Dec. 31, 2011
Basis Of Presentation [Line Items]
Percentage of sales accounted for under contract accounting standards			45.00%
Percentage of fixed-price type contracts			35.00%
Percentage of cost-plus type contracts			10.00%
Period of performance for contracts accounted for under the percentage-of-completion method of accounting, minimum	1 year
Increase in consolidated operating income due to changes in contract estimates	$ 75	$ 65
Percentage of increase in consolidated operating income due to changes in contract estimates	7.60%	4.70%
CODES due 2035 [Member]
Basis Of Presentation [Line Items]
Interest rate on debt instruments	3.00%