Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Retirement Plans
Components of net periodic benefit cost
Service cost	$ 225	$ 209	$ 671	$ 634
Interest cost	351	361	1,054	1,084
Expected return on plan assets	(643)	(680)	(1,924)	(2,042)
Amortization of prior service cost/‍(credit)	(46)	(47)	(138)	(139)
Recognized actuarial (gains)/losses	43	(50)	130	(150)
Curtailments and settlements	6	109	(2)	109
Net periodic benefit cost/(credit)	(64)	(98)	(209)	(504)
Other Benefit Plans
Components of net periodic benefit cost
Service cost	69	61	207	198
Interest cost	53	51	157	160
Expected return on plan assets	(2)	(1)	(5)	(4)
Amortization of prior service cost/‍(credit)	0	0	(1)	(1)
Recognized actuarial (gains)/losses	13	4	39	17
Curtailments and settlements	0	(4)	0	(4)
Net periodic benefit cost/(credit)	$ 133	$ 111	$ 397	$ 366