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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Assets |  |  |  |
Investments | $ 64 | $ 1,785 |  |
Publicly traded equity securities | 779 | 838 |  |
Derivative assets | 710 | 288 |  |
Liabilities |  |  |  |
Contingent consideration | 694 | 767 | $ 667 | $ 788
Derivative liabilities | 93 | 97 |  |
Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 2 | 0 |  |
Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 0 | 621 |  |
Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 0 | 668 |  |
Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 0 | 227 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | $ 62 | 269 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 562 | 2,243 |  |
Other assets | 281 | 380 |  |
Derivative assets | 710 | 288 |  |
Total assets | 1,553 | 2,911 |  |
Liabilities |  |  |  |
Contingent consideration | 694 | 767 |  |
Derivative liabilities | 93 | 97 |  |
Total liabilities | 787 | 864 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 455 | 169 |  |
Liabilities |  |  |  |
Derivative liabilities | 90 | 95 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 81 | 15 |  |
Fair Value, Measurements, Recurring | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 174 | 104 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 1 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 1 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 560 | 518 |  |
Other assets | 281 | 380 |  |
Derivative assets | 0 | 0 |  |
Total assets | 841 | 898 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Total 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 | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 0 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 2 | 1,725 |  |
Other assets | 0 | 0 |  |
Derivative assets | 710 | 288 |  |
Total assets | 712 | 2,013 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 93 | 97 |  |
Total liabilities | 93 | 97 |  |
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 455 | 169 |  |
Liabilities |  |  |  |
Derivative liabilities | 90 | 95 |  |
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 81 | 15 |  |
Fair Value, Measurements, Recurring | Level 2 | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 174 | 104 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 1 |  |
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 1 |  |
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 | 694 | 767 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 694 | 767 |  |
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 | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 0 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 2 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 2 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Level 3 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 0 | 621 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 0 | 621 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 3 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 0 | 668 |  |
Fair Value, Measurements, Recurring | Commercial paper | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Commercial paper | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 0 | 668 |  |
Fair Value, Measurements, Recurring | Commercial paper | Level 3 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | 0 | 227 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 0 | 227 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | 0 | 209 |  |
Other assets | 62 | 60 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 1 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 62 | 60 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 2 |  |  |  |
Assets |  |  |  |
Investments | 0 | 209 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 3 |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities |  |  |  |
Assets |  |  |  |
Publicly traded equity securities | 560 | 518 |  |
Other assets | 219 | 320 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 1 |  |  |  |
Assets |  |  |  |
Publicly traded equity securities | 560 | 518 |  |
Other assets | 219 | 320 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 2 |  |  |  |
Assets |  |  |  |
Publicly traded equity securities | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 3 |  |  |  |
Assets |  |  |  |
Publicly traded equity securities | 0 | 0 |  |
Other assets | $ 0 | $ 0 |  |

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