v3.26.1
Fair value measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Dec. 28, 2025
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets $ 1,317    
Derivatives designated as hedging instruments : Liabilities 5,471    
Available-for-sale Securities, Equity Securities 803   $ 665
Available-for-sale Securities 5,360   2,854
Contingent consideration 823   753
Total Gross Assets 1,384   1,313
Credit Support Agreement (CSA) (1,292)   (1,308)
Total Net Asset 92   5
Total Gross Liabilities 5,538   6,307
Credit Support Agreement (CSA) (5,421)   (5,903)
Total Net Liabilities 117   404
Beginning Balance 753 $ 1,217  
Changes in estimated fair value(6) 6 (60)  
Additions 64 0  
Payments 0 0  
Ending Balance 823 $ 1,157  
Quoted prices in active markets for identical assets and liabilities Level 1      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Available-for-sale Securities, Equity Securities 803   665
Available-for-sale Securities 0    
Contingent consideration 0    
Significant other observable inputs Level 2      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 1,317   1,275
Derivatives designated as hedging instruments : Liabilities 5,471   6,261
Available-for-sale Securities, Equity Securities 0    
Available-for-sale Securities 5,360    
Contingent consideration 0    
Significant unobservable inputs Level 3      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Available-for-sale Securities, Equity Securities 0    
Available-for-sale Securities 0    
Contingent consideration 823   753
Interest Rate Contract      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 685    
Derivatives designated as hedging instruments : Liabilities 4,757    
Interest Rate Contract | Quoted prices in active markets for identical assets and liabilities Level 1      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Interest Rate Contract | Significant other observable inputs Level 2      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 685   589
Derivatives designated as hedging instruments : Liabilities 4,757   5,848
Interest Rate Contract | Significant unobservable inputs Level 3      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Forward foreign exchange contracts      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 632    
Derivatives designated as hedging instruments : Liabilities 714    
Derivatives not designated as hedging instruments : Assets 67    
Derivatives not designated as hedging instruments : Liabilities 67    
Forward foreign exchange contracts | Quoted prices in active markets for identical assets and liabilities Level 1      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Derivatives not designated as hedging instruments : Assets 0    
Derivatives not designated as hedging instruments : Liabilities 0    
Forward foreign exchange contracts | Significant other observable inputs Level 2      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 632   686
Derivatives designated as hedging instruments : Liabilities 714   413
Derivatives not designated as hedging instruments : Assets 67   38
Derivatives not designated as hedging instruments : Liabilities 67   $ 46
Forward foreign exchange contracts | Significant unobservable inputs Level 3      
Financial assets and liabilities at fair value      
Derivatives designated as hedging instruments : Assets 0    
Derivatives designated as hedging instruments : Liabilities 0    
Derivatives not designated as hedging instruments : Assets 0    
Derivatives not designated as hedging instruments : Liabilities $ 0