Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,626	$ 1,420	$ 3,343	$ 3,124
Other comprehensive income, net of tax
Recognition of previously deferred postretirement benefit plan amounts	110	227	220	454
Other, net	28	28	(69)	28
Other comprehensive income, net of tax	138	255	151	482
Comprehensive income	$ 1,764	$ 1,675	$ 3,494	$ 3,606