Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 02, 2022	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Tax Credit Carryforward [Line Items]
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent			(2.50%)
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%
Income tax expense recorded related to TRAF				$ 400
TRAF effect on tax rate				2.60%
Income tax expense related to change in tax rate from TRAF				$ 300
Deferred tax asset recorded related to TRAF				450
Deferred tax expense related to TRAF				$ 300
Effective income tax rate reconciliation, deduction				1.20%
Unrecognized tax benefits	$ 3,323	$ 3,829	$ 3,323	$ 3,373	$ 3,853
Unrecognized tax benefits, interest on income tax expense		139	44	32
Unrecognized tax benefits, interest on income taxes accrued	512	$ 651	512
Effective Income Tax Rate Reconciliation, Increase (Decrease), Percent		9.10%
Incremental tax costs		$ 3,784	$ 1,898	1,783
Consumer Health Business
Tax Credit Carryforward [Line Items]
Effective Income Tax Rate Reconciliation, Increase (Decrease), Percent		2.20%
Incremental tax costs		$ 500
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
Consumer Health
Tax Credit Carryforward [Line Items]
Litigation expense			1,600	3,900
Pharmaceutical
Tax Credit Carryforward [Line Items]
Litigation expense		$ 100	600	$ 800
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