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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets |  |  |
Investments | $ 15,183 | $ 20,179 |
Derivative assets | 130 | 995 |
Liabilities |  |  |
Contingent consideration | 935 | 891 | $ 590
Derivative liabilities | 217 | 134 |
Commercial paper |  |  |
Assets |  |  |
Investments | 159 | 4,330 |
Corporate notes and bonds |  |  |
Assets |  |  |
Investments | 9,806 | 10,577 |
U.S. government and agency securities |  |  |
Assets |  |  |
Investments | 2,042 | 2,232 |
Asset-backed securities |  |  |
Assets |  |  |
Investments | $ 1,542 | 1,376 |
Liabilities |  |  |
Primary weighted-average lives of investment collateral (or less) | 5 years |  |
Mortgage-backed securities |  |  |
Assets |  |  |
Investments | $ 626 | 796 |
Foreign government bonds |  |  |
Assets |  |  |
Investments | 733 | 519 |
Equity securities |  |  |
Assets |  |  |
Investments | 275 | 349 |
Fair Value, Measurements, Recurring |  |  |
Assets |  |  |
Investments | 14,531 | 19,242 |
Other assets | 652 | 937 |
Derivative assets | 130 | 995 |
Total assets | 15,313 | 21,174 |
Liabilities |  |  |
Contingent consideration | 935 | 891 |
Derivative liabilities | 217 | 134 |
Total liabilities | 1,152 | 1,025 |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 80 | 644 |
Liabilities |  |  |
Derivative liabilities | 0 | 12 |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 48 | 331 |
Liabilities |  |  |
Derivative liabilities | 162 | 93 |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 2 | 20 |
Liabilities |  |  |
Derivative liabilities | 55 | 29 |
Fair Value, Measurements, Recurring | Commercial paper |  |  |
Assets |  |  |
Investments | 159 | 4,330 |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |
Assets |  |  |
Investments | 9,678 | 10,389 |
Other assets | 128 | 188 |
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |
Assets |  |  |
Investments | 1,835 | 1,919 |
Other assets | 207 | 313 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets |  |  |
Investments | 1,476 | 1,257 |
Other assets | 66 | 119 |
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |  |
Assets |  |  |
Investments | 547 | 628 |
Other assets | 79 | 168 |
Fair Value, Measurements, Recurring | Foreign government bonds |  |  |
Assets |  |  |
Investments | 732 | 518 |
Other assets | 1 | 1 |
Fair Value, Measurements, Recurring | Equity securities |  |  |
Assets |  |  |
Investments | 104 | 201 |
Other assets | 171 | 148 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Investments | 172 | 230 |
Other assets | 171 | 148 |
Derivative assets | 0 | 0 |
Total assets | 343 | 378 |
Liabilities |  |  |
Contingent consideration | 0 | 0 |
Derivative liabilities | 0 | 0 |
Total liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Commercial paper |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Corporate notes and bonds |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. government and agency securities |  |  |
Assets |  |  |
Investments | 68 | 29 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Mortgage-backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign government bonds |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Equity securities |  |  |
Assets |  |  |
Investments | 104 | 201 |
Other assets | 171 | 148 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Investments | 14,359 | 19,012 |
Other assets | 481 | 789 |
Derivative assets | 130 | 995 |
Total assets | 14,970 | 20,796 |
Liabilities |  |  |
Contingent consideration | 0 | 0 |
Derivative liabilities | 217 | 134 |
Total liabilities | 217 | 134 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 80 | 644 |
Liabilities |  |  |
Derivative liabilities | 0 | 12 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 48 | 331 |
Liabilities |  |  |
Derivative liabilities | 162 | 93 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 2 | 20 |
Liabilities |  |  |
Derivative liabilities | 55 | 29 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper |  |  |
Assets |  |  |
Investments | 159 | 4,330 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes and bonds |  |  |
Assets |  |  |
Investments | 9,678 | 10,389 |
Other assets | 128 | 188 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities |  |  |
Assets |  |  |
Investments | 1,767 | 1,890 |
Other assets | 207 | 313 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |  |
Assets |  |  |
Investments | 1,476 | 1,257 |
Other assets | 66 | 119 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities |  |  |
Assets |  |  |
Investments | 547 | 628 |
Other assets | 79 | 168 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government bonds |  |  |
Assets |  |  |
Investments | 732 | 518 |
Other assets | 1 | 1 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Derivative assets | 0 | 0 |
Total assets | 0 | 0 |
Liabilities |  |  |
Contingent consideration | 935 | 891 |
Derivative liabilities | 0 | 0 |
Total liabilities | 935 | 891 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Purchased currency options |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts |  |  |
Assets |  |  |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate notes and bonds |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government bonds |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Other assets | $ 0 | $ 0 |

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