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Fair value measurement - Schedule of Fair Value of Financial Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Available-for-sale securities: $ 8,708 $ 11,486
Equity securities 6,819 4,188
Derivatives:    
Total assets 15,669 16,094
Derivatives:    
Contingent consideration obligations 95 106
Total liabilities 999 1,128
Foreign currency forward contracts    
Derivatives:    
Foreign currency forward contracts 93 420
Derivatives:    
Derivative liabilities 261 8
Cross-currency swap contracts    
Derivatives:    
Foreign currency forward contracts 48  
Derivatives:    
Derivative liabilities 337 483
Interest rate swap contracts    
Derivatives:    
Interest rate swap contracts 1  
Derivatives:    
Interest rate swap contracts 306 531
Quoted prices in active markets  for identical assets (Level 1)    
Assets:    
Equity securities 6,819 4,188
Derivatives:    
Total assets 14,400 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 contracts    
Derivatives:    
Foreign currency forward contracts 0 0
Derivatives:    
Derivative liabilities 0 0
Quoted prices in active markets  for identical assets (Level 1) | Cross-currency swap contracts    
Derivatives:    
Foreign currency forward contracts 0  
Derivatives:    
Derivative liabilities 0 0
Quoted prices in active markets  for identical assets (Level 1) | Interest rate swap contracts    
Derivatives:    
Interest rate swap contracts 0  
Derivatives:    
Interest rate swap contracts 0 0
Significant other observable inputs (Level 2)    
Assets:    
Equity securities 0 0
Derivatives:    
Total assets 1,269 1,552
Derivatives:    
Contingent consideration obligations 0 0
Total liabilities 904 1,022
Significant other observable inputs (Level 2) | Foreign currency forward contracts    
Derivatives:    
Foreign currency forward contracts 93 420
Derivatives:    
Derivative liabilities 261 8
Significant other observable inputs (Level 2) | Cross-currency swap contracts    
Derivatives:    
Foreign currency forward contracts 48  
Derivatives:    
Derivative liabilities 337 483
Significant other observable inputs (Level 2) | Interest rate swap contracts    
Derivatives:    
Interest rate swap contracts 1  
Derivatives:    
Interest rate swap contracts 306 531
Significant unobservable inputs (Level 3)    
Assets:    
Equity securities 0 0
Derivatives:    
Total assets 0 0
Derivatives:    
Contingent consideration obligations 95 106
Total liabilities 95 106
Significant unobservable inputs (Level 3) | Foreign currency forward contracts    
Derivatives:    
Foreign currency forward contracts 0 0
Derivatives:    
Derivative liabilities 0 0
Significant unobservable inputs (Level 3) | Cross-currency swap contracts    
Derivatives:    
Foreign currency forward contracts 0  
Derivatives:    
Derivative liabilities 0 0
Significant unobservable inputs (Level 3) | Interest rate swap contracts    
Derivatives:    
Interest rate swap contracts 0  
Derivatives:    
Interest rate swap contracts 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: 7,581 10,354
Money market mutual funds | Quoted prices in active markets  for identical assets (Level 1)    
Assets:    
Available-for-sale securities: 7,581 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: 129 135
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: 129 135
Other short-term interest-bearing securities | Significant unobservable inputs (Level 3)    
Assets:    
Available-for-sale securities: $ 0 $ 0