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Common stock, stock option plans and stock compensation agreements - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
StockBasedCompensationPlans
$ / shares
shares
Jan. 01, 2023
USD ($)
$ / shares
shares
Jan. 02, 2022
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 | $ $ 1,087 $ 1,028 $ 1,038
Total income tax benefit recognized | $ 221 177 199
Exercise of options, tax benefit | $ 126 267 213
Total compensation cost not yet recognized for option | $ $ 907 $ 866 $ 775
Weighted average period for total compensation cost not yet recognized 1 year 9 months 18 days 1 year 9 months 18 days 1 year 9 months 10 days
Average fair value of option granted (in dollars per share) | $ / shares $ 27.85 $ 23.23 $ 20.86
Total intrinsic value of options exercised | $ $ 729 $ 1,228 $ 919
Options cancelled in period (in shares) 7,689    
Stock options outstanding (in shares) 112,238,000 118,672,000 117,361,000
Stock option average life 5 years 6 months 5 years 9 months 18 days 5 years 9 months 18 days
Stock options exercisable (in shares)   63,661,000 62,742,000
Stock options average price (in dollars per share) | $ / shares   $ 113.06 $ 104.42
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 $ 152.63 $ 153.67 $ 152.62
Fair Value of RSU or PSU units settled | $ $ 605 $ 591 $ 611
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 $ 145.17 $ 170.46 $ 179.35
Fair Value of RSU or PSU units settled | $ $ 140 $ 94 $ 83
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) 150,000,000    
Shares issued subject to stock options or stock appreciation rights (in shares) 110,000,000    
Shares subject to full value awards (in shares) 40,000,000    
Shares subject to full value award, excess (in shares) 40,000,000    
Shares available for future grants under long-term incentive plan 130,000,000