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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, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | $ 14,206 | $ 14,908 |  |
Investments | 332 |  |  |
Assets |  |  |  |
Derivative assets | 109 | 130 |  |
Liabilities |  |  |  |
Contingent consideration | 919 | 935 | $ 925 | $ 891
Derivative liabilities | 324 | 217 |  |
Commercial paper |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 130 | 159 |  |
Corporate notes and bonds |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 9,860 | 9,806 |  |
U.S. government and agency securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 1,810 | 2,042 |  |
Asset-backed securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | $ 1,569 | 1,542 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
Foreign government bonds |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | $ 759 | 733 |  |
Mortgage-backed securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 78 | 626 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 13,896 | 14,531 |  |
Other assets | 642 | 652 |  |
Derivative assets | 109 | 130 |  |
Total assets | 14,647 | 15,313 |  |
Liabilities |  |  |  |
Contingent consideration | 919 | 935 |  |
Derivative liabilities | 324 | 217 |  |
Total liabilities | 1,243 | 1,152 |  |
Fair Value, Measurements, Recurring | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 46 | 80 |  |
Liabilities |  |  |  |
Derivative liabilities | 1 | 0 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 63 | 48 |  |
Liabilities |  |  |  |
Derivative liabilities | 208 | 162 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 2 |  |
Liabilities |  |  |  |
Derivative liabilities | 115 | 55 |  |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 164 | 172 |  |
Other assets | 232 | 171 |  |
Derivative assets | 0 | 0 |  |
Total assets | 396 | 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 | 13,732 | 14,359 |  |
Other assets | 410 | 481 |  |
Derivative assets | 109 | 130 |  |
Total assets | 14,251 | 14,970 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 324 | 217 |  |
Total liabilities | 324 | 217 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 46 | 80 |  |
Liabilities |  |  |  |
Derivative liabilities | 1 | 0 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 63 | 48 |  |
Liabilities |  |  |  |
Derivative liabilities | 208 | 162 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 2 |  |
Liabilities |  |  |  |
Derivative liabilities | 115 | 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 | 919 | 935 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 919 | 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 |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 130 | 159 |  |
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 130 | 159 |  |
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 9,741 | 9,678 |  |
Assets |  |  |  |
Other assets | 119 | 128 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 9,741 | 9,678 |  |
Assets |  |  |  |
Other assets | 119 | 128 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 1,585 | 1,835 |  |
Assets |  |  |  |
Other assets | 225 | 207 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 68 |  |
Assets |  |  |  |
Other assets | 64 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 1,585 | 1,767 |  |
Assets |  |  |  |
Other assets | 161 | 207 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 1,517 | 1,476 |  |
Assets |  |  |  |
Other assets | 52 | 66 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 1,517 | 1,476 |  |
Assets |  |  |  |
Other assets | 52 | 66 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 759 | 732 |  |
Assets |  |  |  |
Other assets | 0 | 1 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 759 | 732 |  |
Assets |  |  |  |
Other assets | 0 | 1 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 547 |  |
Assets |  |  |  |
Other assets | 78 | 79 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 547 |  |
Assets |  |  |  |
Other assets | 78 | 79 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 164 | 104 |  |
Assets |  |  |  |
Other assets | 168 | 171 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 164 | 104 |  |
Assets |  |  |  |
Other assets | 168 | 171 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items] |  |  |  |
Investments | 0 | 0 |  |
Assets |  |  |  |
Other assets | $ 0 | $ 0 |  |

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