Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,837	$ 1,717
Other comprehensive income, net of tax
Recognition of previously deferred postretirement benefit plan amounts	140	110
Other, net	(27)	(97)
Other comprehensive income, net of tax	113	13
Comprehensive income	$ 1,950	$ 1,730