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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
Assets |  |  |  |
Investments | $ 16,234 | $ 20,179 |  |
Derivative assets | 221 | 995 |  |
Liabilities |  |  |  |
Contingent consideration | 945 | 891 | $ 894 | $ 590
Derivative liabilities | 227 | 134 |  |
Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 695 | 4,330 |  |
Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 10,259 | 10,577 |  |
U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | 1,924 | 2,232 |  |
Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 1,473 | 1,376 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | $ 640 | 519 |  |
Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | 704 | 796 |  |
Equity securities |  |  |  |
Assets |  |  |  |
Investments | 539 | 349 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 15,500 | 19,242 |  |
Other assets | 734 | 937 |  |
Derivative assets | 221 | 995 |  |
Total assets | 16,455 | 21,174 |  |
Liabilities |  |  |  |
Contingent consideration | 945 | 891 |  |
Derivative liabilities | 227 | 134 |  |
Total liabilities | 1,172 | 1,025 |  |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 119 | 644 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 12 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 87 | 331 |  |
Liabilities |  |  |  |
Derivative liabilities | 201 | 93 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 15 | 20 |  |
Liabilities |  |  |  |
Derivative liabilities | 26 | 29 |  |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 436 | 230 |  |
Other assets | 171 | 148 |  |
Derivative assets | 0 | 0 |  |
Total assets | 607 | 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 | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 15,064 | 19,012 |  |
Other assets | 563 | 789 |  |
Derivative assets | 221 | 995 |  |
Total assets | 15,848 | 20,796 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 227 | 134 |  |
Total liabilities | 227 | 134 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 119 | 644 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 12 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 87 | 331 |  |
Liabilities |  |  |  |
Derivative liabilities | 201 | 93 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 15 | 20 |  |
Liabilities |  |  |  |
Derivative liabilities | 26 | 29 |  |
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 | 945 | 891 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 945 | 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 | Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 695 | 4,330 |  |
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 | 695 | 4,330 |  |
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 | 10,110 | 10,389 |  |
Other assets | 149 | 188 |  |
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 | 10,110 | 10,389 |  |
Other assets | 149 | 188 |  |
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 | 1,690 | 1,919 |  |
Other assets | 234 | 313 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 68 | 29 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 1,622 | 1,890 |  |
Other assets | 234 | 313 |  |
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 | 1,395 | 1,257 |  |
Other assets | 78 | 119 |  |
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 | 1,395 | 1,257 |  |
Other assets | 78 | 119 |  |
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 | 639 | 518 |  |
Other assets | 1 | 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 | 639 | 518 |  |
Other assets | 1 | 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 | 603 | 628 |  |
Other assets | 101 | 168 |  |
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 | 603 | 628 |  |
Other assets | 101 | 168 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |
Assets |  |  |  |
Investments | 368 | 201 |  |
Other assets | 171 | 148 |  |
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 368 | 201 |  |
Other assets | 171 | 148 |  |
Fair Value, Measurements, Recurring | Equity securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Equity securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | $ 0 | $ 0 |  |

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