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Summary of significant accounting policies - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 23, 2023 | May 08, 2023 USD ($) $ / shares shares | Dec. 29, 2024 USD ($) Segment Employee $ / shares | Dec. 31, 2023 USD ($) $ / shares | Jan. 01, 2023 USD ($) | Jan. 02, 2022 USD ($) | Jan. 03, 2021 | Dec. 29, 2019 | Jul. 02, 2023 USD ($)
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Number of employees | Employee |  |  | 138,100 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  | $ 1.00 | $ 1.00 |  |  |  |  |
Proceeds from Kenvue initial public offering |  |  | $ 0 | $ 4,241 | $ 0 |  |  |  |
Realized gain (loss) on investment |  | $ 2,500 |  |  |  |  |  |  |
Number of business segments | Segment |  |  | 2 |  |  |  |  |  |
Supplier finance program, obligation, current |  |  | $ 788 | $ 704 |  |  |  |  |
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] |  |  | Accounts Payable, Current | Accounts Payable, Current |  |  |  |  |
Minimum reverse repurchase agreement collateral (as a percent) |  |  | 102.00% |  |  |  |  |  |
Accrued rebates, returns and promotions |  |  | $ 17,580 | $ 16,001 |  |  |  |  |
Sales return reserve (as a percent) |  |  | 1.00% | 1.00% | 1.00% |  |  |  |
Percentage of profit share payments (less than) |  |  | 2.00% | 2.00% | 3.00% |  |  |  |
Cost of products sold |  |  | $ 27,471 | $ 26,553 | $ 24,596 |  |  |  |
Shipping and handling costs as a percent of sales |  |  | 1.00% | 1.00% | 1.00% |  |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  |  | Other assets, noncurrent | Other assets, noncurrent |  |  |  |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  | Accrued Liabilities, Current | Accrued Liabilities, Current |  |  |  |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |  |  |  |  |
Operating lease, right-of-use asset |  |  | $ 1,100 | $ 1,000 |  |  |  |  |
Operating lease liabilities |  |  | 1,200 | 1,100 |  |  |  |  |
Operating lease costs |  |  | 200 | 200 | $ 200 |  |  |  |
Cash paid for operating leases |  |  | 200 | 200 | 200 |  |  |  |
Advertising expense |  |  | $ 600 | $ 500 | $ 700 |  |  |  |
U.S. statutory rate |  |  | 21.00% | 21.00% | 21.00% |  | 21.00% | 35.00% |
TCJA, undistributed foreign earnings percent related to cash and cash equivalents |  |  |  |  |  |  | 15.50% |  |
TCJA, undistributed foreign earnings percent related to earnings other than cash and cash equivalents |  |  |  |  |  |  | 8.00% |  |
TCJA, transition tax for accumulated foreign earnings, payment period |  |  | 8 years |  |  |  |  |  |
TJCA , provisional liability, non-current |  |  | $ 2,500 |  |  |  |  |  |
Repatriation of foreign earnings amount |  |  | 500 |  |  |  |  |  |
Selling, marketing and administrative expenses |  |  | $ 22,869 | $ 21,512 | $ 20,246 |  |  |  |
Supplier finance program, payment timing, period |  |  | 90 days |  |  |  |  |  |
Yellow Jersey Therapeutics |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire in Process Research and Development |  |  | $ 1,250 |  |  |  |  |  |
Kenvue Inc. |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Split-off percentage | 80.10% |  |  |  |  |  |  |  |
Kenvue Inc. |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.01 |  |  |  |  |  |  |
Sale of stock (in USD per share) | $ / shares |  | $ 22.00 |  |  |  |  |  |  |
Johnson & Johnson | Kenvue Inc. |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Percentage ownership after transaction |  | 89.60% |  |  |  |  |  |  |
Common stock, value |  |  |  |  |  |  |  |  | $ 1,300
Percentage ownership after transaction | 9.50% |  |  |  |  |  |  |  |
IPO | Kenvue Inc. |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  | 198,734,444 |  |  |  |  |  |  |
Proceeds from Kenvue initial public offering |  | $ 4,200 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue, performance obligation, payment terms |  |  | 30 days |  |  |  |  |  |
Minimum | Software Development |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 3 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue, performance obligation, payment terms |  |  | 90 days |  |  |  |  |  |
Maximum | Software Development |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  | 8 years |  |  |  |  |  |
R&D Expense | Project Concentration Risk |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, threshold percentage (as a percent) |  |  | 0.05 | 0.05 | 0.05 |  |  |  |
Shipping and Handling |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Selling, marketing and administrative expenses |  |  | $ 900 | $ 900 |  | $ 800 |  |  |
Pharmaceutical |  |  |  |  |  |  |  |  |
Concentration of Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Accrued rebates, returns and promotions |  |  | $ 12,300 | $ 11,500 |  |  |  |  |

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