Retirement Plans - Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Jan. 04, 2020
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	$ (1,148)	$ 144	$ 218
Amortization of net actuarial gain (loss)	(150)	(184)	(99)
Amortization of prior service credit (cost)	(7)	(6)	(8)
Cost associated with defined the defined contribution component	131	128	130
Pension Benefits
Net periodic benefit cost (income)
Service cost	116	106	91
Interest cost	252	293	326
Expected return on plan assets	(573)	(574)	(556)
Amortization of prior service cost (credit)	12	11	14
Amortization of net actuarial loss (gain)	152	185	101
Net periodic benefit cost (income)	(41)	21	(24)
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	(1,135)	146	207
Current year prior service cost	20	8	0
Amortization of net actuarial gain (loss)	(152)	(185)	(101)
Amortization of prior service credit (cost)	(12)	(11)	(14)
Total recognized in OCI, before taxes	(1,279)	(42)	92
Total recognized in net periodic benefit cost (income) and OCI	(1,320)	(21)	68
Pension Benefits | United States
Other changes in plan assets and benefit obligations recognized in OCI
Cost associated with defined the defined contribution component	11	11	13
Postretirement Benefits Other than Pensions
Net periodic benefit cost (income)
Service cost	3	2	3
Interest cost	5	8	10
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(5)	(5)	(6)
Amortization of net actuarial loss (gain)	(2)	(1)	(2)
Net periodic benefit cost (income)	1	4	5
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	(13)	(2)	11
Current year prior service cost	0	0	0
Amortization of net actuarial gain (loss)	2	1	2
Amortization of prior service credit (cost)	5	5	6
Total recognized in OCI, before taxes	(6)	4	19
Total recognized in net periodic benefit cost (income) and OCI	$ (5)	$ 8	$ 24