Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Dec. 31, 2012
Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage of sales accounted for under contract accounting standards			48.00%
Percentage of fixed-price type contracts			39.00%
Percentage of cost-plus type contracts			9.00%
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	$ 44	$ 63
Percentage of increase in consolidated operating income due to changes in contract estimates	7.10%	9.60%
CODES Due 2035 [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Interest rate on debt instruments	3.00%
Debt instruments, maturity year	2035