Retirement Plans - Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Jan. 04, 2020
Pension Benefits
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$ 9,833	$ 8,938
Service cost	116	106	$ 91
Interest cost	252	293	326
Plan participants’ contributions	0	0
Actuarial losses (gains)	(436)	888
Benefits paid	(446)	(429)
Plan amendment	18	8
Foreign exchange rate changes and other	2	29
Projected benefit obligation at end of year	9,339	9,833	8,938
Change in fair value of plan assets
Balance at beginning of year	9,080	8,129
Actual return on plan assets	1,273	1,312
Employer contributions	42	37
Benefits paid	(446)	(429)
Foreign exchange rate changes and other	(2)	31
Balance at end of year	9,947	9,080	8,129
Funded status at end of year	608	(753)
Postretirement Benefits Other than Pensions
Change in projected benefit obligation
Projected benefit obligation at beginning of year	230	246
Service cost	3	2	3
Interest cost	5	8	10
Plan participants’ contributions	4	5
Actuarial losses (gains)	(13)	(2)
Benefits paid	(27)	(29)
Plan amendment	0	0
Foreign exchange rate changes and other	0	0
Projected benefit obligation at end of year	202	230	$ 246
Change in fair value of plan assets
Funded status at end of year	$ (202)	$ (230)