Basis of Presentation - Additional Information (Detail) $ in Millions		3 Months Ended
	Apr. 22, 2016 USD ($) $ / Product	Mar. 25, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 27, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percentage of net sales accounted for under contract accounting standards		49.00%
Percentage of fixed-price type contracts		41.00%
Percentage of cost-plus type contracts		8.00%
Period of performance for contracts accounted for under the percentage-of-completion method of accounting, minimum		1 year
Increase in operating income due to changes in contract estimates		$ 60		$ 32
Percentage of increase in consolidated operating income due to changes in contract estimates		24.00%		17.00%
Total expected cost of the voluntary return program		$ 35
Product returns allowance		25	$ 20
Electronic Systems [Member]
Summary Of Significant Accounting Policies [Line Items]
Reduction to net sales		$ 15	$ 20
Subsequent Event [Member]
Summary Of Significant Accounting Policies [Line Items]
Approved refunds cost	$ 21
Average refund cost per unit | $ / Product	507