Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 2,918	$ 4,412	$ 3,972
Other comprehensive earnings:
Unrealized (loss) gain on debt securities net of income taxes of $(214), $(68) and $47 in 2022, 2021 and 2020, respectively.	(626)	(201)	139
Reclassification adjustment for net realized loss (gain) on debt securities net of income taxes of $1, $(5) and $(5) in 2022, 2021 and 2020, respectively.	1	(16)	(13)
Adjustment to postretirement benefit obligation net of income taxes of $7, $3 and $(2) in 2022, 2021 and 2020, respectively.	21	11	(6)
Comprehensive earnings	$ 2,314	$ 4,206	$ 4,092