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Fair value measurements - Summary of Activity Related to Equity Investments (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 23, 2023 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Equity Investment [Roll Forward] |  |  |  |
Other assets, noncurrent |  | $ 11,414 | $ 14,153 |
Equity securities, FV-NI, gain (loss) |  | 400 | 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 |  | 451 | 4,473 | $ 576
Equity, fair value adjustment |  | (17) | (368) |
Equity investments, increase (decrease) from acquisition (sale) during period |  | (4,005) | 4,265 |
Other assets, noncurrent |  | 451 | 4,473 |
Equity securities | Equity Investments without readily determinable value |  |  |  |
Equity Investment [Roll Forward] |  |  |  |
Equity securities without readily determinable fair value, amount |  | 773 | 696 | $ 613
Equity, fair value adjustment |  | (197) | 1 |
Equity investments, increase (decrease) from acquisition (sale) during period |  | 274 | 82 |
Other assets, noncurrent |  | $ 773 | $ 696 |

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