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Fair value measurement - Fair Value of Financial Assets and Liabilities on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Assets: |  |  |  |
Available-for-sale securities: | $ 10,404 | $ 4,335 |  |
Other investments | 0 | 130 |  |
Equity securities | 4,514 | 815 |  |
Derivatives: |  |  |  |
Total assets | 15,063 | 5,621 |  |
Derivatives: |  |  |  |
Contingent consideration obligations | 96 | 270 | $ 342 | $ 33
Total liabilities | 1,188 | 1,668 |  |
Foreign currency forward contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 145 | 287 |  |
Derivatives: |  |  |  |
Derivative liabilities | 116 | 76 |  |
Cross-currency swap contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 0 | 54 |  |
Derivatives: |  |  |  |
Derivative liabilities | 405 | 541 |  |
Interest rate swap contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 0 |  |  |
Derivatives: |  |  |  |
Derivative liabilities | 571 | 776 |  |
Forward interest rate contracts |  |  |  |
Derivatives: |  |  |  |
Derivative liabilities | 0 | 5 |  |
U.S. Treasury bills |  |  |  |
Assets: |  |  |  |
Available-for-sale securities: | 0 | 1,676 |  |
Money market mutual funds |  |  |  |
Assets: |  |  |  |
Available-for-sale securities: | 10,266 | 2,659 |  |
Other short-term interest-bearing securities |  |  |  |
Assets: |  |  |  |
Available-for-sale securities: | 138 | 0 |  |
Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Assets: |  |  |  |
Other investments | 0 | 0 |  |
Equity securities | 4,514 | 480 |  |
Derivatives: |  |  |  |
Total assets | 14,780 | 4,815 |  |
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 |  |  |
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 bills |  |  |  |
Assets: |  |  |  |
Available-for-sale securities: | 0 | 1,676 |  |
Quoted prices in active markets for identical assets (Level 1) | Money market mutual funds |  |  |  |
Assets: |  |  |  |
Available-for-sale securities: | 10,266 | 2,659 |  |
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 | 0 | 130 |  |
Equity securities | 0 | 0 |  |
Derivatives: |  |  |  |
Total assets | 283 | 471 |  |
Derivatives: |  |  |  |
Contingent consideration obligations | 0 | 0 |  |
Total liabilities | 1,092 | 1,398 |  |
Significant other observable inputs (Level 2) | Foreign currency forward contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 145 | 287 |  |
Derivatives: |  |  |  |
Derivative liabilities | 116 | 76 |  |
Significant other observable inputs (Level 2) | Cross-currency swap contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 0 | 54 |  |
Derivatives: |  |  |  |
Derivative liabilities | 405 | 541 |  |
Significant other observable inputs (Level 2) | Interest rate swap contracts |  |  |  |
Derivatives: |  |  |  |
Derivative assets | 0 |  |  |
Derivatives: |  |  |  |
Derivative liabilities | 571 | 776 |  |
Significant other observable inputs (Level 2) | Forward interest rate contracts |  |  |  |
Derivatives: |  |  |  |
Derivative liabilities | 0 | 5 |  |
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: | 138 | 0 |  |
Significant unobservable inputs (Level 3) |  |  |  |
Assets: |  |  |  |
Other investments | 0 | 0 |  |
Equity securities | 0 | 335 |  |
Derivatives: |  |  |  |
Total assets | 0 | 335 |  |
Derivatives: |  |  |  |
Contingent consideration obligations | 96 | 270 |  |
Total liabilities | 96 | 270 |  |
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 |  |  |
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 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 |  |

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