v3.26.1
Segments of business and geographic areas - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 28, 2026
USD ($)
Jun. 29, 2025
USD ($)
Jun. 28, 2026
USD ($)
segment
Jun. 29, 2025
USD ($)
Oct. 14, 2025
Segment Reporting [Line Items]          
Number of operating segments | segment     2    
Number of reportable segments | segment     2    
Sales to customers (Note 9) | $ $ 25,310 $ 23,743 $ 49,372 $ 45,636  
Innovative Medicine          
Segment Reporting [Line Items]          
Sales to customers (Note 9) | $ $ 16,384 $ 15,202 $ 31,810 $ 29,075  
Innovative Medicine | Change in Accounting Method Accounted for as Change in Estimate          
Segment Reporting [Line Items]          
Adjustments To Revenue Recognized, Percent 3.00% 2.60% 3.80% 3.50%  
Minimum | Orthopaedics Business          
Segment Reporting [Line Items]          
Disposal group, estimated term to complete         18 months
Maximum | Orthopaedics Business          
Segment Reporting [Line Items]          
Disposal group, estimated term to complete         24 months