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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 |  |

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