Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Components of net periodic benefit cost
Amendments	$ (1,800)
Retirement Plans
Components of net periodic benefit cost
Service cost	1,380	$ 1,163	$ 1,283
Interest cost	955	1,096	996
Expected return on plan assets	(2,461)	(2,322)	(2,212)
Amortization of prior service cost	2	4	3
Recognized actuarial losses (gains)	891	579	852
Curtailments and settlements	23	73	1
Net periodic benefit cost	790	593	923
Amendments	(1,780)	0
Other Benefit Plans
Components of net periodic benefit cost
Service cost	287	274	269
Interest cost	133	185	148
Expected return on plan assets	(7)	(6)	(7)
Amortization of prior service cost	(31)	(31)	(31)
Recognized actuarial losses (gains)	142	129	123
Curtailments and settlements	0	0	0
Net periodic benefit cost	524	551	$ 502
Amendments	$ 0	$ 0