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Income taxes - Comparison of Income Taxes at Statutory Rate and Company's Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Oct. 01, 2023 | Jul. 02, 2023 | Apr. 02, 2023 | Jan. 01, 2023 | Oct. 02, 2022 | Jul. 03, 2022 | Apr. 03, 2022 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022 | Dec. 29, 2019 | Dec. 30, 2018
Comparison Of Income Tax Expense At Statutory Rate And Company's Tax Rate Abstract |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | $ (2,033) | $ 4,606 | $ 4,275 |  |
International |  |  |  |  |  |  |  |  | 17,095 | 14,753 | 14,903 |  |
Earnings before provision for taxes on income | $ 4,826 | $ 5,217 | $ 6,306 | $ (1,287) | $ 3,840 | $ 5,172 | $ 5,144 | $ 5,203 | $ 15,062 | $ 19,359 | $ 19,178 |  |
Tax rates: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. statutory rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00% | 21.00% | 35.00%
International operations |  |  |  |  |  |  |  |  | (8.10%) | (5.00%) | (19.10%) |  |
U.S. Tax Settlements |  |  |  |  |  |  |  |  | (3.00%) | 0.00% | 0.00% |  |
U.S. taxes on international income |  |  |  |  |  |  |  |  | (0.30%) | (1.10%) | 8.90% |  |
Tax benefits from loss on capital assets |  |  |  |  | (1.60%) |  |  |  |  |  | (1.60%) |  |
Tax benefits on share-based compensation |  |  |  |  |  |  |  |  | (0.80%) | (1.40%) | (1.20%) |  |
All other |  |  |  |  |  |  |  |  | 2.70% | 1.90% | (0.80%) |  |
Effective Rate |  |  |  |  |  |  |  |  | 11.50% | 15.40% | 7.20% |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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