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Fair value measurement - (Fair Value of Financial Assets and Liabilities on Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets:        
Available-for-sale securities: $ 4,335 $ 7,304    
Other investments 130 0    
Equity securities 815 831    
Derivatives:        
Total assets 5,621 8,400    
Derivatives:        
Contingent consideration obligations 270 342 $ 33 $ 61
Total liabilities 1,668 876    
Foreign currency forward contracts        
Derivatives:        
Derivative assets 287 183    
Derivatives:        
Derivative liabilities 76 39    
Cross-currency swap contracts        
Derivatives:        
Derivative assets 54 66    
Derivatives:        
Derivative liabilities 541 339    
Interest rate swap contracts        
Derivatives:        
Derivative assets 0 16    
Derivatives:        
Derivative liabilities 776 156    
Forward interest rate contracts        
Derivatives:        
Derivative liabilities 5 0    
U.S. Treasury notes        
Assets:        
Available-for-sale securities: 0 47    
U.S. Treasury bills        
Assets:        
Available-for-sale securities: 1,676 1,400    
Money market mutual funds        
Assets:        
Available-for-sale securities: 2,659 5,856    
Other short-term interest-bearing securities        
Assets:        
Available-for-sale securities: 0 1    
Quoted prices in active markets for identical assets (Level 1)        
Assets:        
Other investments 0 0    
Equity securities 480 611    
Derivatives:        
Total assets 4,815 7,914    
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 assets 0 0    
Derivatives:        
Derivative liabilities 0 0    
Quoted prices in active markets for identical assets (Level 1) | Interest rate swap contracts        
Derivatives:        
Derivative assets 0 0    
Derivatives:        
Derivative liabilities 0 0    
Quoted prices in active markets for identical assets (Level 1) | Forward interest rate contracts        
Derivatives:        
Derivative liabilities 0 0    
Quoted prices in active markets for identical assets (Level 1) | U.S. Treasury notes        
Assets:        
Available-for-sale securities: 0 47    
Quoted prices in active markets for identical assets (Level 1) | U.S. Treasury bills        
Assets:        
Available-for-sale securities: 1,676 1,400    
Quoted prices in active markets for identical assets (Level 1) | Money market mutual funds        
Assets:        
Available-for-sale securities: 2,659 5,856    
Quoted prices in active markets for identical assets (Level 1) | Other short-term interest-bearing securities        
Assets:        
Available-for-sale securities: 0 0    
Significant other observable inputs (Level 2)        
Assets:        
Other investments 130 0    
Equity securities 0 0    
Derivatives:        
Total assets 471 266    
Derivatives:        
Contingent consideration obligations 0 0    
Total liabilities 1,398 534    
Significant other observable inputs (Level 2) | Foreign currency forward contracts        
Derivatives:        
Derivative assets 287 183    
Derivatives:        
Derivative liabilities 76 39    
Significant other observable inputs (Level 2) | Cross-currency swap contracts        
Derivatives:        
Derivative assets 54 66    
Derivatives:        
Derivative liabilities 541 339    
Significant other observable inputs (Level 2) | Interest rate swap contracts        
Derivatives:        
Derivative assets 0 16    
Derivatives:        
Derivative liabilities 776 156    
Significant other observable inputs (Level 2) | Forward interest rate contracts        
Derivatives:        
Derivative liabilities 5 0    
Significant other observable inputs (Level 2) | U.S. Treasury notes        
Assets:        
Available-for-sale securities: 0 0    
Significant other observable inputs (Level 2) | U.S. Treasury bills        
Assets:        
Available-for-sale securities: 0 0    
Significant other observable inputs (Level 2) | Money market mutual funds        
Assets:        
Available-for-sale securities: 0 0    
Significant other observable inputs (Level 2) | Other short-term interest-bearing securities        
Assets:        
Available-for-sale securities: 0 1    
Significant unobservable inputs (Level 3)        
Assets:        
Other investments 0 0    
Equity securities 335 220    
Derivatives:        
Total assets 335 220    
Derivatives:        
Contingent consideration obligations 270 342    
Total liabilities 270 342    
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 assets 0 0    
Derivatives:        
Derivative liabilities 0 0    
Significant unobservable inputs (Level 3) | Interest rate swap contracts        
Derivatives:        
Derivative assets 0 0    
Derivatives:        
Derivative liabilities 0 0    
Significant unobservable inputs (Level 3) | Forward interest rate contracts        
Derivatives:        
Derivative liabilities 0 0    
Significant unobservable inputs (Level 3) | U.S. Treasury notes        
Assets:        
Available-for-sale securities: 0 0    
Significant unobservable inputs (Level 3) | U.S. Treasury bills        
Assets:        
Available-for-sale securities: 0 0    
Significant unobservable inputs (Level 3) | Money market mutual funds        
Assets:        
Available-for-sale securities: 0 0    
Significant unobservable inputs (Level 3) | Other short-term interest-bearing securities        
Assets:        
Available-for-sale securities: $ 0 $ 0