Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Retirement Plans
Components of net periodic benefit cost
Service cost	$ 222	$ 215	$ 446	$ 425
Interest cost	351	371	703	723
Expected return on plan assets	(639)	(694)	(1,281)	(1,362)
Amortization of prior service cost/‍(credit)	(46)	(46)	(92)	(92)
Recognized actuarial (gains)/losses	44	(50)	87	(100)
Curtailments and settlements	(8)	0	(8)	0
Net periodic benefit cost/(credit)	(76)	(204)	(145)	(406)
Other Benefit Plans
Components of net periodic benefit cost
Service cost	69	69	138	137
Interest cost	52	55	104	109
Expected return on plan assets	(1)	(2)	(3)	(3)
Amortization of prior service cost/‍(credit)	(1)	(1)	(1)	(1)
Recognized actuarial (gains)/losses	13	7	26	13
Curtailments and settlements	0	0	0	0
Net periodic benefit cost/(credit)	$ 132	$ 128	$ 264	$ 255