Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Retirement Plans
Components of net periodic benefit cost
Service cost	$ 319	$ 327	$ 640	$ 680
Interest cost	229	193	459	386
Expected return on plan assets	(693)	(647)	(1,392)	(1,327)
Amortization of prior service cost/(credit)	(46)	(45)	(92)	(90)
Recognized actuarial losses	167	316	329	630
Curtailments and settlements	0	0	1	1
Net periodic benefit cost	(24)	144	(55)	280
Other Benefit Plans
Components of net periodic benefit cost
Service cost	80	77	160	154
Interest cost	27	21	53	41
Expected return on plan assets	(2)	(2)	(4)	(4)
Amortization of prior service cost/(credit)	(2)	(7)	(3)	(15)
Recognized actuarial losses	31	37	61	75
Curtailments and settlements	0	0	0	0
Net periodic benefit cost	$ 134	$ 126	$ 267	$ 251