CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 25, 2022	Mar. 26, 2022	Jun. 26, 2021	Mar. 27, 2021	Jun. 25, 2022	Jun. 26, 2021
Statement of Comprehensive Income [Abstract]
Net earnings	$ 628,405		$ 1,009,404		$ 1,246,431	$ 2,504,497
Other Comprehensive Earnings [Abstract]
Unrealized (loss) gain on debt securities net of income taxes in 2022 and 2021, respectively.	(175,084)		12,977		(549,727)	(90,571)
Reclassification adjustment for net realized gain on debt securities net of income taxes in 2022 and 2021, respectively.	(82)		(3,333)		(908)	(8,916)
Adjustment to postretirement benefit obligation net of income taxes in 2022 and 2021, respectively.	339		1,380		677	2,759
Comprehensive earnings	$ 453,578	$ 242,895	$ 1,020,428	$ 1,387,341	$ 696,473	$ 2,407,769