Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26	$ 30
Interest cost	100	90
Expected return on plan assets	(228)	(241)
Net actuarial loss (gain)	54	103
Prior service credit	(5)	(5)
Net periodic benefit credit	(53)	(23)
Other Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2
Interest cost	5	5
Expected return on plan assets	(8)	(9)
Net actuarial loss (gain)	(4)	0
Prior service credit	0	0
Net periodic benefit credit	$ (6)	$ (2)