Other - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Mar. 26, 2017	Mar. 26, 2017	Mar. 27, 2016
Additional charge to costs		$ 120
Additional charge to costs, after tax		$ 74
Additional charge to costs, per share		$ 0.25
Cumulative losses including reserves	$ 260
Increase in operating profit due to profit rate adjustments		$ 290	$ 360
Increase in net earnings due to profit rate adjustments		$ 189	$ 234
Increase in diluted earnings per common share due to profit rate adjustments		$ 0.65	$ 0.76
Effective income tax rate		23.30%	18.90%
Percentage of reduction of effective tax rate due to equity awards tax benefit		6.20%	10.40%