Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,698	$ 1,608	$ 5,041	$ 4,732
Other comprehensive income, net of tax
Recognition of previously deferred postretirement benefit plan amounts	110	227	330	681
Other, net	34	(41)	(35)	(13)
Other comprehensive income, net of tax	144	186	295	668
Comprehensive income	$ 1,842	$ 1,794	$ 5,336	$ 5,400