Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 25, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,704	$ 1,157
Other comprehensive income, net of tax
Recognition of previously deferred postretirement benefit plan amounts	227	300
Other, net	0	58
Other comprehensive income, net of tax	227	358
Comprehensive income	$ 1,931	$ 1,515