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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, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Assets |  |  |  |
Investments | $ 17,139 | $ 20,179 |  |
Derivative assets | 340 | 995 |  |
Liabilities |  |  |  |
Contingent consideration | 1,002 | 891 | $ 661 | $ 590
Derivative liabilities | 201 | 134 |  |
Commercial paper |  |  |  |
Assets |  |  |  |
Investments | 1,607 | 4,330 |  |
Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 10,469 | 10,577 |  |
U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | 2,009 | 2,232 |  |
Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 1,399 | 1,376 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 710 | 796 |  |
Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 569 | 519 |  |
Equity securities |  |  |  |
Assets |  |  |  |
Investments | 376 | 349 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 16,319 | 19,242 |  |
Other assets | 820 | 937 |  |
Derivative assets | 340 | 995 |  |
Total assets | 17,479 | 21,174 |  |
Liabilities |  |  |  |
Contingent consideration | 1,002 | 891 |  |
Derivative liabilities | 201 | 134 |  |
Total liabilities | 1,203 | 1,025 |  |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 180 | 644 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 12 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 139 | 331 |  |
Liabilities |  |  |  |
Derivative liabilities | 178 | 93 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 21 | 20 |  |
Liabilities |  |  |  |
Derivative liabilities | 23 | 29 |  |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 280 | 230 |  |
Other assets | 163 | 148 |  |
Derivative assets | 0 | 0 |  |
Total assets | 443 | 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 | 16,039 | 19,012 |  |
Other assets | 657 | 789 |  |
Derivative assets | 340 | 995 |  |
Total assets | 17,036 | 20,796 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 201 | 134 |  |
Total liabilities | 201 | 134 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 180 | 644 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 12 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 139 | 331 |  |
Liabilities |  |  |  |
Derivative liabilities | 178 | 93 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 21 | 20 |  |
Liabilities |  |  |  |
Derivative liabilities | 23 | 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 | 1,002 | 891 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 1,002 | 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 | 1,607 | 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 | 1,607 | 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 | 10,305 | 10,389 |  |
Other assets | 164 | 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 | 10,305 | 10,389 |  |
Other assets | 164 | 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 | 1,716 | 1,919 |  |
Other assets | 293 | 313 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 67 | 29 |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 1,649 | 1,890 |  |
Other assets | 293 | 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 | 1,314 | 1,257 |  |
Other assets | 85 | 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 | 1,314 | 1,257 |  |
Other assets | 85 | 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 | Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | 596 | 628 |  |
Other assets | 114 | 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 | 596 | 628 |  |
Other assets | 114 | 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 | Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 568 | 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 | 568 | 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 | Equity securities |  |  |  |
Assets |  |  |  |
Investments | 213 | 201 |  |
Other assets | 163 | 148 |  |
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 213 | 201 |  |
Other assets | 163 | 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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