v3.25.4
Fair value measurement - Fair Value of Financial Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets:      
Available-for-sale securities: $ 8,525 $ 11,486  
Equity securities $ 6,144 $ 4,188  
Derivatives:      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent Other Assets, Current  
Derivative asset   $ 420  
Total assets $ 14,913 16,094  
Derivatives:      
Contingent consideration obligations 161 106 $ 96
Total liabilities 988 1,128  
Foreign currency forward contract gains      
Derivatives:      
Derivative asset 196    
Derivatives:      
Derivative liabilities 214 8  
Cross-currency swap contract gains (losses)      
Derivatives:      
Derivative asset 48    
Derivatives:      
Derivative liabilities 320 483  
Interest rate swap contracts      
Derivatives:      
Derivative liabilities 293 531  
Quoted prices in active markets for identical assets (Level 1)      
Assets:      
Equity securities 6,144 4,188  
Derivatives:      
Derivative asset   0  
Total assets 13,539 14,542  
Derivatives:      
Contingent consideration obligations 0 0  
Total liabilities 0 0  
Quoted prices in active markets for identical assets (Level 1) | Foreign currency forward contract gains      
Derivatives:      
Derivative asset 0    
Derivatives:      
Derivative liabilities 0 0  
Quoted prices in active markets for identical assets (Level 1) | Cross-currency swap contract gains (losses)      
Derivatives:      
Derivative asset 0    
Derivatives:      
Derivative liabilities 0 0  
Quoted prices in active markets for identical assets (Level 1) | Interest rate swap contracts      
Derivatives:      
Derivative liabilities 0 0  
Significant other observable inputs (Level 2)      
Assets:      
Equity securities 0 0  
Derivatives:      
Derivative asset   420  
Total assets 1,374 1,552  
Derivatives:      
Contingent consideration obligations 0 0  
Total liabilities 827 1,022  
Significant other observable inputs (Level 2) | Foreign currency forward contract gains      
Derivatives:      
Derivative asset 196    
Derivatives:      
Derivative liabilities 214 8  
Significant other observable inputs (Level 2) | Cross-currency swap contract gains (losses)      
Derivatives:      
Derivative asset 48    
Derivatives:      
Derivative liabilities 320 483  
Significant other observable inputs (Level 2) | Interest rate swap contracts      
Derivatives:      
Derivative liabilities 293 531  
Significant unobservable inputs (Level 3)      
Assets:      
Equity securities 0 0  
Derivatives:      
Derivative asset   0  
Total assets 0 0  
Derivatives:      
Contingent consideration obligations 161 106  
Total liabilities 161 106  
Significant unobservable inputs (Level 3) | Foreign currency forward contract gains      
Derivatives:      
Derivative asset 0    
Derivatives:      
Derivative liabilities 0 0  
Significant unobservable inputs (Level 3) | Cross-currency swap contract gains (losses)      
Derivatives:      
Derivative asset 0    
Derivatives:      
Derivative liabilities 0 0  
Significant unobservable inputs (Level 3) | Interest rate swap contracts      
Derivatives:      
Derivative liabilities 0 0  
U.S. Treasury bills      
Assets:      
Available-for-sale securities: 998 997  
U.S. Treasury bills | Quoted prices in active markets for identical assets (Level 1)      
Assets:      
Available-for-sale securities: 0 0  
U.S. Treasury bills | Significant other observable inputs (Level 2)      
Assets:      
Available-for-sale securities: 998 997  
U.S. Treasury bills | Significant unobservable inputs (Level 3)      
Assets:      
Available-for-sale securities: 0 0  
Money market mutual funds      
Assets:      
Available-for-sale securities: 7,395 10,354  
Money market mutual funds | Quoted prices in active markets for identical assets (Level 1)      
Assets:      
Available-for-sale securities: 7,395 10,354  
Money market mutual funds | Significant other observable inputs (Level 2)      
Assets:      
Available-for-sale securities: 0 0  
Money market mutual funds | Significant unobservable inputs (Level 3)      
Assets:      
Available-for-sale securities: 0 0  
Other short-term interest-bearing securities      
Assets:      
Available-for-sale securities: 132 135  
Other short-term interest-bearing securities | Quoted prices in active markets for identical assets (Level 1)      
Assets:      
Available-for-sale securities: 0 0  
Other short-term interest-bearing securities | Significant other observable inputs (Level 2)      
Assets:      
Available-for-sale securities: 132 135  
Other short-term interest-bearing securities | Significant unobservable inputs (Level 3)      
Assets:      
Available-for-sale securities: $ 0 $ 0