Pensions and Other Benefit Plans - Schedule of Net Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Change in Benefit Obligation
Amendments	$ (1,800)
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	656	$ 551
Current liabilities	(547)	(514)
Non-current liabilities	(10,771)	(10,663)
Lump-sum distribution
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Contribution to pension plans		514
Retirement Plans
Change in Benefit Obligation
Projected benefit obligation - beginning of year	37,188	31,670
Service cost	1,380	1,163	$ 1,283
Interest cost	955	1,096	996
Plan participant contributions	61	63
Amendments	(1,780)	0
Actuarial (gains) losses(2)	5,716	5,178
Divestitures & acquisitions	(88)	(278)
Curtailments, settlements & restructuring	(24)	(172)
Benefits paid from plan	(1,111)	(1,555)
Effect of exchange rates	1,003	23
Projected benefit obligation - end of year	43,300	37,188	31,670
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value — beginning of year	32,201	26,818
Actual return on plan assets	5,524	6,185
Company contributions	870	908
Plan participant contributions	61	63
Settlements	(13)	(16)
Divestitures & acquisitions	(84)	(274)
Benefits paid from plan assets	(1,111)	(1,555)
Effect of exchange rates	747	72
Plan assets at fair value - End of year	38,195	32,201	26,818
Funded status - end of year	(5,105)	(4,987)
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	656	551
Current liabilities	(125)	(113)
Non-current liabilities	(5,636)	(5,425)
Total recognized in the consolidated balance sheet — end of year	(5,105)	(4,987)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	10,860	8,835
Prior service cost (credit)(1)	(1,797)	(8)
Unrecognized net transition obligation	0	0
Total before tax effects	9,063	8,827
Accumulated Benefit Obligation	40,356	33,416
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract]
Net periodic benefit cost	790	593	923
Net actuarial (gain) loss	2,616	1,084
Amortization of net actuarial loss	(891)	(579)
Prior service cost (credit)	(1,780)	0
Amortization of prior service (cost) credit	(2)	(4)
Effect of exchange rates	293	1
Total loss/(income) recognized in other comprehensive income, before tax	236	502
Total recognized in net periodic benefit cost and other comprehensive income	1,026	1,095
Other Benefit Plans
Change in Benefit Obligation
Projected benefit obligation - beginning of year	5,076	4,480
Service cost	287	274	269
Interest cost	133	185	148
Plan participant contributions	0	0
Amendments	0	0
Actuarial (gains) losses(2)	(75)	562
Divestitures & acquisitions	0	0
Curtailments, settlements & restructuring	0	0
Benefits paid from plan	(396)	(431)
Effect of exchange rates	3	6
Projected benefit obligation - end of year	5,028	5,076	4,480
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value — beginning of year	115	180
Actual return on plan assets	14	19
Company contributions	357	347
Plan participant contributions	0	0
Settlements	0	0
Divestitures & acquisitions	0	0
Benefits paid from plan assets	(396)	(431)
Effect of exchange rates	0	0
Plan assets at fair value - End of year	90	115	180
Funded status - end of year	(4,938)	(4,961)
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	0	0
Current liabilities	(418)	(397)
Non-current liabilities	(4,520)	(4,564)
Total recognized in the consolidated balance sheet — end of year	(4,938)	(4,961)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	1,463	1,685
Prior service cost (credit)(1)	(44)	(75)
Unrecognized net transition obligation	0	0
Total before tax effects	1,419	1,610
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract]
Net periodic benefit cost	524	551	$ 502
Net actuarial (gain) loss	(81)	550
Amortization of net actuarial loss	(142)	(129)
Prior service cost (credit)	0	0
Amortization of prior service (cost) credit	31	31
Effect of exchange rates	1	1
Total loss/(income) recognized in other comprehensive income, before tax	(191)	453
Total recognized in net periodic benefit cost and other comprehensive income	$ 333	$ 1,004