Fair value measurements - Summary of Activity Related to Equity Investments (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 29, 2026 |
Dec. 28, 2025 |
|
| Equity Investment [Roll Forward] | ||
| Non Current Other Assets | $ 14,105 | $ 14,368 |
| Equity Securities | Equity Investments with readily determinable value | ||
| Equity Investment [Roll Forward] | ||
| Carrying value, beginning of period | 665 | |
| Equity, Fair Value Adjustment | 43 | |
| Sales/ Purchases/Other | (5) | |
| Carrying value, end of period | 703 | |
| Non Current Other Assets | 703 | |
| Equity Securities | Equity Investments without readily determinable value | ||
| Equity Investment [Roll Forward] | ||
| Carrying value, beginning of period | 910 | |
| Equity, Fair Value Adjustment | 46 | |
| Sales/ Purchases/Other | (68) | |
| Carrying value, end of period | 888 | |
| Non Current Other Assets | $ 888 |