Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17	$ 26	$ 50	$ 78
Interest cost	163	100	488	300
Expected return on plan assets	(207)	(227)	(622)	(682)
Net actuarial loss (gain)	183	54	550	161
Prior service (credit) cost	(4)	(5)	(11)	(15)
Net periodic benefit cost (credit)	152	(52)	455	(158)
Other Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	3	4
Interest cost	7	4	22	14
Expected return on plan assets	(8)	(7)	(24)	(23)
Net actuarial loss (gain)	(7)	(4)	(23)	(13)
Prior service (credit) cost	1	0	2	1
Net periodic benefit cost (credit)	$ (6)	$ (6)	$ (20)	$ (17)