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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, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Assets |  |  |  |
Investments | $ 6,343 | $ 7,261 |  |
Investments | 636 | 456 |  |
Derivative assets | 384 | 454 |  |
Liabilities |  |  |  |
Contingent consideration | 667 | 788 | $ 919 | $ 935
Derivative liabilities | 195 | 160 |  |
Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 4,310 | 4,920 |  |
Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | $ 1,094 | 1,275 |  |
Liabilities |  |  |  |
Primary weighted average life of collateral | 5 years |  |  |
U.S. government and agency securities |  |  |  |
Assets |  |  |  |
Investments | $ 832 | 892 |  |
Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 99 | 166 |  |
Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Investments | 8 | 8 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Investments | 6,343 | 7,132 |  |
Other assets | 636 | 585 |  |
Derivative assets | 384 | 454 |  |
Total assets | 7,363 | 8,171 |  |
Liabilities |  |  |  |
Contingent consideration | 667 | 788 |  |
Derivative liabilities | 195 | 160 |  |
Total liabilities | 862 | 948 |  |
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 194 | 241 |  |
Liabilities |  |  |  |
Derivative liabilities | 144 | 74 |  |
Fair Value, Measurements, Recurring | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 190 | 213 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 5 |  |
Fair Value, Measurements, Recurring | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 48 | 81 |  |
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 209 | 147 |  |
Other assets | 483 | 364 |  |
Derivative assets | 0 | 0 |  |
Total assets | 692 | 511 |  |
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) | 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) | 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) | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 6,134 | 6,985 |  |
Other assets | 153 | 221 |  |
Derivative assets | 384 | 454 |  |
Total assets | 6,671 | 7,660 |  |
Liabilities |  |  |  |
Contingent consideration | 0 | 0 |  |
Derivative liabilities | 195 | 160 |  |
Total liabilities | 195 | 160 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Assets |  |  |  |
Derivative assets | 194 | 241 |  |
Liabilities |  |  |  |
Derivative liabilities | 144 | 74 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 190 | 213 |  |
Liabilities |  |  |  |
Derivative liabilities | 3 | 5 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 48 | 81 |  |
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 | 667 | 788 |  |
Derivative liabilities | 0 | 0 |  |
Total liabilities | 667 | 788 |  |
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) | Currency options |  |  |  |
Assets |  |  |  |
Derivative assets | 0 | 0 |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts |  |  |  |
Liabilities |  |  |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Corporate notes and bonds |  |  |  |
Assets |  |  |  |
Investments | 4,231 | 4,835 |  |
Other assets | 79 | 85 |  |
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 | 4,231 | 4,835 |  |
Other assets | 79 | 85 |  |
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 | Asset-backed securities |  |  |  |
Assets |  |  |  |
Investments | 1,069 | 1,253 |  |
Other assets | 25 | 22 |  |
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 | 1,069 | 1,253 |  |
Other assets | 25 | 22 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | 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 | 735 | 731 |  |
Other assets | 97 | 161 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Other assets | 56 | 55 |  |
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 735 | 731 |  |
Other assets | 41 | 106 |  |
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 | Foreign government bonds |  |  |  |
Assets |  |  |  |
Investments | 99 | 166 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Investments | 99 | 166 |  |
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Investments | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |  |  |
Assets |  |  |  |
Other assets | 8 | 8 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Other assets | 8 | 8 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Other assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities |  |  |  |
Assets |  |  |  |
Investments | 209 | 147 |  |
Other assets | 427 | 309 |  |
Fair Value, Measurements, Recurring | Publicly traded equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Investments | 209 | 147 |  |
Other assets | 427 | 309 |  |
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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