Retirement Plans - Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Jan. 04, 2020	Dec. 29, 2018
Pension Benefits
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$ 8,938	$ 7,901
Service cost	106	91	$ 104
Interest cost	293	326	306
Plan participants’ contributions	0	0
Actuarial losses (gains)	888	1,001
Benefits paid	(429)	(421)
Plan amendment	8	0
Foreign exchange rate changes and other	29	40
Projected benefit obligation at end of year	9,833	8,938	7,901
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance at beginning of year	8,129	7,122
Actual return on plan assets	1,312	1,350
Employer contributions	37	38
Benefits paid	(429)	(421)
Foreign exchange rate changes and other	31	40
Balance at end of year	9,080	8,129	7,122
Funded status at end of year	(753)	(809)
Postretirement Benefits Other than Pensions
Change in projected benefit obligation
Projected benefit obligation at beginning of year	246	250
Service cost	2	3	3
Interest cost	8	10	10
Plan participants’ contributions	5	5
Actuarial losses (gains)	(2)	11
Benefits paid	(29)	(33)
Plan amendment	0	0
Foreign exchange rate changes and other	0	0
Projected benefit obligation at end of year	230	246	250
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance at beginning of year
Actual return on plan assets
Employer contributions
Benefits paid
Foreign exchange rate changes and other
Balance at end of year
Funded status at end of year	$ (230)	$ (246)