CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,367,055	$ 661,057	$ 2,034,390	$ 1,642,028
Other comprehensive earnings:
Unrealized gain on debt securities net of income taxes in 2020 and 2019, respectively.	260,078	58,130	122,495	117,651
Reclassification adjustment for net realized (gain) loss on debt securities net of income taxes in 2020 and 2019, respectively.	(2,195)	37	(3,921)	330
Adjustment to postretirement benefit obligation net of income taxes in 2020.	814	0	1,629	0
Comprehensive earnings	$ 1,625,752	$ 719,224	$ 2,154,593	$ 1,760,009