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Income taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 29, 2024
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Tax Credit Carryforward [Line Items]          
Effective income tax rate reconciliation, increase (decrease), percent 3.00% 4.20% (3.90%)    
Decrease in foreign tax credits $ 400        
Decrease in foreign tax credits, percent 2.60%        
Deferred tax assets, tax basis increase of certain assets due to reorganization $ 300   $ 300    
Effective income tax rate reconciliation, GILTI, amount   $ 100      
Increase (decrease) in deferred tax liabilities, global intangible low-taxed income (GILTI)     300    
Unrecognized tax benefits 2,485 2,020 2,485 $ 3,716 $ 3,210
Unrecognized tax benefits, interest on income tax expense   217 99 136  
Unrecognized tax benefits, interest on income taxes accrued $ 264 274 264    
Unrecognized tax benefits, period increase (decrease)   $ 200      
State and Local Jurisdiction          
Tax Credit Carryforward [Line Items]          
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent   3.40%      
Talc | Consumer Health          
Tax Credit Carryforward [Line Items]          
Litigation expense   $ 5,100 $ 7,000 $ 7,000  
Effective income tax rate reconciliation, tax settlement, percent       21.10%