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Fair value measurements - Summary of Activity Related to Equity Investments (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 23, 2023 | Oct. 01, 2023 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Equity Investment [Roll Forward] |  |  |  |  |
Other assets, noncurrent |  |  | $ 14,153 | $ 9,212 |
Equity securities, FV-NI, gain (loss) |  | $ (600) | 400 |  |
Kenvue Inc. | Johnson & Johnson |  |  |  |  |
Equity Investment [Roll Forward] |  |  |  |  |
Percentage ownership after transaction | 9.50% |  |  |  |
Equity securities | Equity Investments with readily determinable value |  |  |  |  |
Equity Investment [Roll Forward] |  |  |  |  |
Marketable securities, noncurrent |  |  | 4,473 | 576 | $ 1,884
Equity, fair value adjustment |  |  | (368) | (538) |
Equity investments, increase (decrease) from acquisition (sale) during period |  |  | 4,265 | (770) |
Other assets, noncurrent |  |  | 4,473 | 576 |
Equity securities | Equity Investments without readily determinable value |  |  |  |  |
Equity Investment [Roll Forward] |  |  |  |  |
Equity securities without readily determinable fair value, amount |  |  | 696 | 613 | $ 413
Equity, fair value adjustment |  |  | 1 | 93 |
Equity investments, increase (decrease) from acquisition (sale) during period |  |  | 82 | 107 |
Other assets, noncurrent |  |  | $ 696 | $ 613 |

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