Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 29, 2019	Jan. 02, 2022	Dec. 29, 2019	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019	Oct. 31, 2020	Oct. 31, 2019	Dec. 30, 2018
Tax Credit Carryforward [Line Items]
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent				(2.50%)	1.90%
Deferred tax assets, tax basis increase of certain assets due to reorganization		$ 2,300		$ 2,300
Increase (decrease) in deferred tax liabilities, global intangible low-taxed income (GILTI)				$ 1,700
Tax benefits from loss on capital assets		1.30%		1.30%	1.20%	0.30%
Income tax expense recorded related to TRAF					$ 400	$ 100
TRAF effect on tax rate					2.60%	0.60%
Income tax expense related to change in tax rate from TRAF					$ 300	$ 600
Deferred tax asset recorded related to TRAF					450	900
Deferred tax expense related to TRAF					$ 300	450
Effective income tax rate reconciliation, deduction					1.20%
Effective tax rate reconciliation, litigation settlement, percent			(2.10%)
Reversal of deferred tax liability						600
Reversal of deferred tax asset						200
Tax Cuts And Jobs Act Of 2017, foreign tax credits, net deferred tax expense (benefit)						$ (400)
TJCA, foreign tax credit percent	1.70%					(2.20%)
Increase (decrease) in earnings before taxes, percent			(23.50%)
TCJA, increase (decrease) in deferred tax asset	$ 300
Increase (decrease) in unrecognized tax benefits						$ 300
Effective tax rate reconciliation, unrecognized tax benefits, percent						1.50%
Unrecognized tax benefits	$ 3,853	$ 3,323	$ 3,853	$ 3,323	$ 3,373	$ 3,853			$ 3,326
Unrecognized tax benefits, interest on income tax expense				44	32	50
Unrecognized tax benefits, interest on income taxes accrued		512		$ 512	468
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent				2.70%
Deferred tax assets, net		600		$ 600
Auris Health | Purchased in-process research and development(1)
Tax Credit Carryforward [Line Items]
Impairment of intangible assets, excluding goodwill		$ 900
Effective income tax rate reconciliation, nondeductible expense, impairment losses, percent		22.40%
Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Payment on unrecognized tax benefit liability					700
Pending Litigation
Tax Credit Carryforward [Line Items]
Loss contingency, estimate of possible loss							$ 5,000	$ 4,000
Consumer Health
Tax Credit Carryforward [Line Items]
Litigation expense				1,600	3,900	400
Pharmaceutical
Tax Credit Carryforward [Line Items]
Litigation expense				600	$ 800	$ 4,300
Talc
Tax Credit Carryforward [Line Items]
Effective income tax rate reconciliation, litigation settlement, percent					0.235
Talc | Consumer Health
Tax Credit Carryforward [Line Items]
Litigation expense				$ 1,600	$ 4,000
Effective income tax rate reconciliation, litigation settlement, percent				0.235
Risperdal | Consumer Health
Tax Credit Carryforward [Line Items]
Litigation expense				$ 800
Effective income tax rate reconciliation, litigation settlement, percent				0.164
Opiods
Tax Credit Carryforward [Line Items]
Effective income tax rate reconciliation, litigation settlement, percent					0.214
Opiods | Pharmaceutical
Tax Credit Carryforward [Line Items]
Litigation expense					$ 1,000