Shareholders' Equity - Before and After Tax Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Jan. 04, 2020
Pension and postretirement benefits adjustments, pre-tax:
Unrealized gains (losses), pre-tax	$ 1,148	$ (144)	$ (218)
Amortization of net actuarial loss, pre-tax	150	184	99
Amortization of prior service cost, pre-tax	7	6	8
Recognition of prior service credit cost, pre-tax	(20)	(8)	0
Pension and postretirement benefits adjustments, net, pre-tax	1,285	38	(111)
Pension and postretirement benefits adjustments, tax:
Unrealized gains (losses), tax (expense) benefit	(271)	35	52
Amortization of net actuarial loss, tax (expense) benefit	(34)	(43)	(23)
Amortization of prior service cost, tax (expense) benefit	(3)	(1)	(2)
Recognition of prior service credit, tax (expense) benefit	4	2	0
Pension and postretirement benefits adjustments, net, tax (expense) benefit	(304)	(7)	27
Pension and postretirement benefits adjustments, after-tax:
Unrealized gains (losses), after-tax	877	(109)	(166)
Amortization of net actuarial loss, after-tax	116	141	76
Amortization of prior service cost, after-tax	4	5	6
Recognition of prior service credit, after-tax	(16)	(6)	0
Pension and postretirement benefits adjustments, net, after-tax	981	31	(84)
Foreign currency translation adjustments, pre-tax:
Foreign currency translation adjustments, pre-tax	(51)	81	(6)
Business disposition, pre-tax	14	0	0
Foreign currency translation adjustments, net, pre-tax	(37)	81	(6)
Foreign currency translation adjustments, tax:
Foreign currency translation adjustments, tax (expense) benefit	0	(3)	2
Business disposition, tax (expense) benefit	0	0	0
Foreign currency translation adjustments, net, tax (expense) benefit	0	(3)	2
Foreign currency translation adjustments, after-tax:
Foreign currency translation adjustments, after-tax	(51)	78	(4)
Business disposition, after-tax	14	0	0
Foreign currency translation adjustments, net, after-tax	(37)	78	(4)
Deferred gains (losses) on hedge contracts, pre-tax:
Current deferrals, pre-tax	3	4	8
Reclassification adjustments, pre-tax	(1)	(6)	(2)
Deferred gains (losses) on hedge contracts, net, pre-tax	2	(2)	6
Deferred gains (losses) on hedge contracts, tax:
Current deferrals, tax (expense) benefit	0	(1)	(3)
Reclassification adjustments, tax (expense) benefit	0	2	0
Deferred gains (losses) on hedge contracts, net, tax (expense) benefit	0	1	(3)
Deferred gains (losses) on hedge contracts, after-tax:
Current deferrals, after-tax	3	3	5
Reclassification adjustments, after-tax	(1)	(4)	(2)
Deferred gains (losses) on hedge contracts, net, after-tax	2	(1)	3
Other comprehensive income (loss), pre-tax	1,250	117	(111)
Other comprehensive income (loss), tax (expense) benefit	(304)	(9)	26
Total other comprehensive income (loss), net of tax	$ 946	$ 108	$ (85)