Kenvue separation and discontinued operations - Details (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Aug. 23, 2023	May 08, 2023	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022	Jul. 02, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, par value per share (in usd per share)			$ 1.00	$ 1.00
Proceeds from Kenvue initial public offering			$ 4,241	$ 0	$ 0
Realized gain (loss) on investment		$ 2,500
Common stock received in exchange offer	$ 31,400
Net assets divested			0	27,237
Accumulated other comprehensive loss			12,527	12,967
Transition service agreement, term	24 months
Separation costs incurred			986	1,089	$ 67
Incremental tax cost				$ 500
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition manufacturing agreement, term	3 months
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition manufacturing agreement, term	5 years
Consumer Health Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net assets divested	$ 11,600
Accumulated other comprehensive loss	4,300
Decrease in noncontrolling interest	1,200
Noncash gain on exchange offer	$ 21,000
Kenvue Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Split-off percentage	80.10%
Kenvue Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock issued in exchange offer (in shares)	190,955,436
Kenvue Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, par value per share (in usd per share)		$ 0.01
Sale of stock (in USD per share)		$ 22.00
Stock issued in exchange offer (in shares)	1,533,830,450
Johnson & Johnson | Kenvue Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership after transaction		89.60%
Common stock, value						$ 1,300
Percentage ownership after transaction	9.50%
Equity securities, fair market value	$ 4,300		$ 400
Johnson & Johnson | Kenvue Inc. | Consumer Health Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncash gain on exchange offer	$ 2,800
IPO | Kenvue Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		198,734,444
Proceeds from Kenvue initial public offering		$ 4,200