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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Assets |  |  |  |
Investments | $ 12,587 | $ 14,908 |  |
Investments | 375 |  |  |
Derivative assets | 444 | 130 |  |
Liabilities |  |  |  |
Contingent consideration | 830 | 935 | $ 1,002 | $ 891
Derivative liabilities | 197 | 217 |  |
Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 30 | 159 |  |
Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 8,782 | 9,806 |  |
U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | 1,620 | 2,042 |  |
Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 1,441 | 1,542 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | $ 649 | 733 |  |
Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | 65 | 626 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 12,317 | 14,531 |  |
Other assets | 645 | 652 |  |
Derivative assets | 444 | 130 |  |
Total assets | 13,406 | 15,313 |  |
Liabilities |  |  |  |
Contingent consideration | 830 | 935 |  |
Derivative liabilities | 197 | 217 |  |
Total liabilities | 1,027 | 1,152 |  |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 142 | 80 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 0 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 302 | 48 |  |
Liabilities |  |  |  |
Derivative liabilities | 62 | 162 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 2 |  |
Liabilities |  |  |  |
Derivative liabilities | 132 | 55 |  |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 164 | 172 |  |
Other assets | 275 | 171 |  |
Derivative assets | 0 | 0 |  |
Total assets | 439 | 343 |  |
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 | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 12,153 | 14,359 |  |
Other assets | 370 | 481 |  |
Derivative assets | 444 | 130 |  |
Total assets | 12,967 | 14,970 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 197 | 217 |  |
Total liabilities | 197 | 217 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 142 | 80 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 0 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 302 | 48 |  |
Liabilities |  |  |  |
Derivative liabilities | 62 | 162 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 2 |  |
Liabilities |  |  |  |
Derivative liabilities | 132 | 55 |  |
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 | 830 | 935 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 830 | 935 |  |
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 | Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 30 | 159 |  |
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 30 | 159 |  |
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 8,684 | 9,678 |  |
Other assets | 98 | 128 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 8,684 | 9,678 |  |
Other assets | 98 | 128 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | 1,396 | 1,835 |  |
Other assets | 224 | 207 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 68 |  |
Other assets | 64 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 1,396 | 1,767 |  |
Other assets | 160 | 207 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | 1,394 | 1,476 |  |
Other assets | 47 | 66 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 1,394 | 1,476 |  |
Other assets | 47 | 66 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 649 | 732 |  |
Other assets | 0 | 1 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 649 | 732 |  |
Other assets | 0 | 1 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | 0 | 547 |  |
Other assets | 65 | 79 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 0 | 547 |  |
Other assets | 65 | 79 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities |  |  |  |
Assets |  |  |  |
Investments | 164 | 104 |  |
Other assets | 211 | 171 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 164 | 104 |  |
Other assets | 211 | 171 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | $ 0 | $ 0 |  |

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