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Fair value measurement - Fair Value of Financial Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Assets:            
Available-for-sale securities: $ 8,812   $ 10,404      
Equity securities 3,470   4,514      
Derivatives:            
Total assets 12,552   15,063      
Derivatives:            
Contingent consideration obligations 107 $ 96 96 $ 248 $ 273 $ 270
Total liabilities 1,134   1,188      
Foreign currency forward contracts            
Derivatives:            
Derivative assets 270   145      
Derivatives:            
Derivative liabilities 28   116      
Cross-currency swap contracts            
Derivatives:            
Derivative liabilities 435   405      
Interest rate swap contracts            
Derivatives:            
Interest rate swap contracts 564   571      
Quoted prices in active markets  for identical assets (Level 1)            
Assets:            
Equity securities 3,470   4,514      
Derivatives:            
Total assets 11,148   14,780      
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:            
Derivative assets 0   0      
Derivatives:            
Derivative liabilities 0   0      
Quoted prices in active markets  for identical assets (Level 1) | Cross-currency swap contracts            
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   0      
Significant other observable inputs (Level 2)            
Assets:            
Equity securities 0   0      
Derivatives:            
Total assets 1,404   283      
Derivatives:            
Contingent consideration obligations 0   0      
Total liabilities 1,027   1,092      
Significant other observable inputs (Level 2) | Foreign currency forward contracts            
Derivatives:            
Derivative assets 270   145      
Derivatives:            
Derivative liabilities 28   116      
Significant other observable inputs (Level 2) | Cross-currency swap contracts            
Derivatives:            
Derivative liabilities 435   405      
Significant other observable inputs (Level 2) | Interest rate swap contracts            
Derivatives:            
Interest rate swap contracts 564   571      
Significant unobservable inputs (Level 3)            
Assets:            
Equity securities 0   0      
Derivatives:            
Total assets 0   0      
Derivatives:            
Contingent consideration obligations 107   96      
Total liabilities 107   96      
Significant unobservable inputs (Level 3) | Foreign currency forward contracts            
Derivatives:            
Derivative assets 0   0      
Derivatives:            
Derivative liabilities 0   0      
Significant unobservable inputs (Level 3) | Cross-currency swap contracts            
Derivatives:            
Derivative liabilities 0   0      
Significant unobservable inputs (Level 3) | Interest rate swap contracts            
Derivatives:            
Interest rate swap contracts 0   0      
U.S. Treasury bills            
Assets:            
Available-for-sale securities: 995   0      
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: 995   0      
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: 7,678   10,266      
Money market mutual funds | Quoted prices in active markets  for identical assets (Level 1)            
Assets:            
Available-for-sale securities: 7,678   10,266      
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: 139   138      
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: 139   138      
Other short-term interest-bearing securities | Significant unobservable inputs (Level 3)            
Assets:            
Available-for-sale securities: $ 0   $ 0