Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2017	Sep. 23, 2016	Sep. 29, 2017	Sep. 23, 2016	Dec. 31, 2016
Accounting Estimates [Abstract]
Increase in operating income due to changes in contract estimates	$ 69	$ 23	$ 150	$ 123
Percentage of increase in consolidated operating income due to changes in contract estimates	28.00%	11.00%	18.00%	17.00%
Increase in operating income due to changes in contract estimates, diluted (in dollars per share)	$ 0.55	$ 0.19	$ 1.21	$ 1.00
Revenue Recognition [Abstract]
Percentage of net sales accounted for under contract accounting standards					50.00%
Percentage of fixed-price type contracts					41.00%
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