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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Investments, debt securities | $ 89 | $ 1,785 |
Publicly traded equity securities | 1,787 | 838 |
Derivative assets | 182 | 288 |
Liabilities |  |  |
Contingent consideration | 841 | 767 | $ 788
Derivative liabilities | 525 | 97 |
Corporate notes and bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 621 |
Asset-backed securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 227 |
U.S. government and agency securities |  |  |
Assets |  |  |
Investments, debt securities | 84 | 269 |
Foreign government bonds |  |  |
Assets |  |  |
Investments, debt securities | 5 | 0 |
Fair Value, Measurements, Recurring |  |  |
Assets |  |  |
Investments | 785 | 2,243 |
Other assets | 1,091 | 380 |
Derivative assets | 182 | 288 |
Total assets | 2,058 | 2,911 |
Liabilities |  |  |
Contingent consideration | 841 | 767 |
Derivative liabilities | 525 | 97 |
Total liabilities | 1,366 | 864 |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 55 | 15 |
Liabilities |  |  |
Derivative liabilities | 0 | 1 |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 90 | 169 |
Liabilities |  |  |
Derivative liabilities | 505 | 95 |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 37 | 104 |
Liabilities |  |  |
Derivative liabilities | 20 | 1 |
Fair Value, Measurements, Recurring | Commercial paper |  |  |
Assets |  |  |
Investments, debt securities | 0 | 668 |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 621 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 227 |
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 209 |
Other assets | 84 | 60 |
Fair Value, Measurements, Recurring | Foreign government bonds |  |  |
Assets |  |  |
Investments, debt securities | 5 | 0 |
Fair Value, Measurements, Recurring | Publicly traded equity securities |  |  |
Assets |  |  |
Publicly traded equity securities | 780 | 518 |
Other assets | 1,007 | 320 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Assets |  |  |
Investments | 780 | 518 |
Other assets | 1,091 | 380 |
Derivative assets | 0 | 0 |
Total assets | 1,871 | 898 |
Liabilities |  |  |
Contingent consideration | 0 | 0 |
Derivative liabilities | 0 | 0 |
Total liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | U.S. government and agency securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Other assets | 84 | 60 |
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Publicly traded equity securities |  |  |
Assets |  |  |
Publicly traded equity securities | 780 | 518 |
Other assets | 1,007 | 320 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Assets |  |  |
Investments | 5 | 1,725 |
Other assets | 0 | 0 |
Derivative assets | 182 | 288 |
Total assets | 187 | 2,013 |
Liabilities |  |  |
Contingent consideration | 0 | 0 |
Derivative liabilities | 525 | 97 |
Total liabilities | 525 | 97 |
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 55 | 15 |
Liabilities |  |  |
Derivative liabilities | 0 | 1 |
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 90 | 169 |
Liabilities |  |  |
Derivative liabilities | 505 | 95 |
Fair Value, Measurements, Recurring | Level 2 | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 37 | 104 |
Liabilities |  |  |
Derivative liabilities | 20 | 1 |
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |  |
Assets |  |  |
Investments, debt securities | 0 | 668 |
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 621 |
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 227 |
Fair Value, Measurements, Recurring | Level 2 | U.S. government and agency securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 209 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds |  |  |
Assets |  |  |
Investments, debt securities | 5 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Publicly traded equity securities |  |  |
Assets |  |  |
Publicly traded equity securities | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Derivative assets | 0 | 0 |
Total assets | 0 | 0 |
Liabilities |  |  |
Contingent consideration | 841 | 767 |
Derivative liabilities | 0 | 0 |
Total liabilities | 841 | 767 |
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | U.S. government and agency securities |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds |  |  |
Assets |  |  |
Investments, debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Publicly traded equity securities |  |  |
Assets |  |  |
Publicly traded equity securities | 0 | 0 |
Other assets | $ 0 | $ 0 |

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