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Capital and treasury stock - Changes in Treasury Stock (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Changes in Treasury Stock Shares Outstanding [Roll Forward] |  |  |
Treasury Stock, beginning balance (shares) | 506,246 | 490,878 | 487,331
Employee compensation and stock option plans (shares) | (15,521) | (20,007) | (17,399)
Treasury Stock, ending balance (shares) | 712,765 | 506,246 | 490,878
Changes in treasury stock |  |  |
Treasury Stock, Balance | $ 41,694 | $ 39,099 | $ 38,490
Employee compensation and stock option plans | (2,529) | (3,440) | (2,847)
Repurchase of common stock | 5,054 | 6,035 | 3,456
Treasury Stock, Ending Balance | $ 75,662 | $ 41,694 | $ 39,099
Treasury Stock Amount |  |  |
Changes in Treasury Stock Shares Outstanding [Roll Forward] |  |  |
Repurchase of common stock (shares) | 31,085 | 35,375 | 20,946
Treasury Stock, ending balance (shares) | 190,955 |  |
Changes in treasury stock |  |  |
Repurchase of common stock | $ 5,054 | $ 6,035 | $ 3,456
Repurchase of common stock | 5,079 |  |
Treasury Stock, Ending Balance | $ 31,418 |  |

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- Definition Treasury Stock, Value, Acquired, Cost Method, Net Of Tax + References No definition available. + Details
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- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481549/505-30-45-1 + Details
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