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Common stock, stock option plans and stock compensation agreements - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 29, 2024 USD ($) StockBasedCompensationPlans $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Jan. 01, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | StockBasedCompensationPlans | 1 |  |
Compensation cost charged for Long term incentive plan | $ | $ 1,176 | $ 1,087 | $ 1,028
Total income tax benefit recognized | $ | 251 | 221 | 177
Exercise of options, tax benefit | $ | 94 | 126 | 267
Total compensation cost not yet recognized for option | $ | $ 1,002 | $ 907 | $ 866
Weighted average period for total compensation cost not yet recognized | 1 year 9 months 21 days | 1 year 9 months 18 days | 1 year 9 months 18 days
Average fair value of option granted (in dollars per share) | $ / shares | $ 27.67 | $ 27.85 | $ 23.23
Total intrinsic value of options exercised | $ | $ 560 | $ 729 | $ 1,228
Stock options outstanding (in shares) | shares | 112,629 | 112,238 | 118,672
Stock option average life | 5 years 3 months 18 days | 5 years 6 months | 5 years 9 months 18 days
Stock options exercisable (in shares) | shares |  | 66,998 | 63,661
Stock options average price (in dollars per share) | $ / shares |  | $ 123.39 | $ 113.06
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options expiration period | 10 years |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Average fair value of RSU's and PSU's granted (in dollars per share) | $ / shares | $ 147.51 | $ 152.63 | $ 153.67
Fair Value of RSU or PSU units settled | $ | $ 833 | $ 605 | $ 591
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Average fair value of RSU's and PSU's granted (in dollars per share) | $ / shares | $ 133.76 | $ 145.17 | $ 170.46
Fair Value of RSU or PSU units settled | $ | $ 146 | $ 140 | $ 94
Minimum | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 6 months |  |
Minimum | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 6 months |  |
Minimum | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 0.00% |  |
Maximum | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 4 years |  |
Maximum | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Maximum | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 200.00% |  |
2022 Long-Term Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance under long-term incentive plan (in shares) | shares | 150,000 |  |
Shares issued subject to stock options or stock appreciation rights (in shares) | shares | 110,000 |  |
Shares subject to full value awards (in shares) | shares | 40,000 |  |
Shares subject to full value award, excess (in shares) | shares | 40,000 |  |
Shares available for future grants under long-term incentive plan | shares | 111,000 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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