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Fair Value Measurements Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Available-for-sale debt securities | $ 19,053 | $ 24,164
Equity investment in Galapagos |  |
Assets: |  |
Total | 2,082 | 622
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Total | 25,269 | 30,552
Liabilities: |  |
Total | 160 | 125
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. treasury securities |  |
Assets: |  |
Available-for-sale debt securities | 2,860 | 3,969
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt securities | 4,152 | 4,361
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | U.S. government agencies securities |  |
Assets: |  |
Available-for-sale debt securities | 1,145 | 938
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Non-U.S. government securities |  |
Assets: |  |
Available-for-sale debt securities | 192 | 305
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt securities | 10,474 | 13,067
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Residential mortgage and asset-backed securities |  |
Assets: |  |
Available-for-sale debt securities | 230 | 1,524
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Equity investment in Galapagos |  |
Assets: |  |
Equity securities | 2,082 | 622
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Money market funds |  |
Assets: |  |
Equity securities | 3,599 | 5,305
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Publicly traded equity securities |  |
Assets: |  |
Equity securities | 296 | 259
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Deferred compensation plan |  |
Assets: |  |
Equity securities | 159 | 124
Liabilities: |  |
Deferred compensation plan | 159 | 124
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Foreign currency derivative contracts |  |
Assets: |  |
Foreign currency derivative contracts | 80 | 78
Liabilities: |  |
Foreign currency derivative contracts | 1 | 1
Fair Value, Measurements, Recurring | Level 1 |  |
Assets: |  |
Total | 8,987 | 10,279
Liabilities: |  |
Total | 159 | 124
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities |  |
Assets: |  |
Available-for-sale debt securities | 2,860 | 3,969
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | U.S. government agencies securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Non-U.S. government securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage and asset-backed securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Equity investment in Galapagos |  |
Assets: |  |
Equity securities | 2,082 | 622
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Assets: |  |
Equity securities | 3,599 | 5,305
Fair Value, Measurements, Recurring | Level 1 | Publicly traded equity securities |  |
Assets: |  |
Equity securities | 287 | 259
Fair Value, Measurements, Recurring | Level 1 | Deferred compensation plan |  |
Assets: |  |
Equity securities | 159 | 124
Liabilities: |  |
Deferred compensation plan | 159 | 124
Fair Value, Measurements, Recurring | Level 1 | Foreign currency derivative contracts |  |
Assets: |  |
Foreign currency derivative contracts | 0 | 0
Liabilities: |  |
Foreign currency derivative contracts | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Assets: |  |
Total | 16,282 | 20,273
Liabilities: |  |
Total | 1 | 1
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt securities | 4,152 | 4,361
Fair Value, Measurements, Recurring | Level 2 | U.S. government agencies securities |  |
Assets: |  |
Available-for-sale debt securities | 1,145 | 938
Fair Value, Measurements, Recurring | Level 2 | Non-U.S. government securities |  |
Assets: |  |
Available-for-sale debt securities | 192 | 305
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt securities | 10,474 | 13,067
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage and asset-backed securities |  |
Assets: |  |
Available-for-sale debt securities | 230 | 1,524
Fair Value, Measurements, Recurring | Level 2 | Equity investment in Galapagos |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Publicly traded equity securities |  |
Assets: |  |
Equity securities | 9 | 0
Fair Value, Measurements, Recurring | Level 2 | Deferred compensation plan |  |
Assets: |  |
Equity securities | 0 | 0
Liabilities: |  |
Deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Foreign currency derivative contracts |  |
Assets: |  |
Foreign currency derivative contracts | 80 | 78
Liabilities: |  |
Foreign currency derivative contracts | 1 | 1
Fair Value, Measurements, Recurring | Level 3 |  |
Assets: |  |
Total | 0 | 0
Liabilities: |  |
Total | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agencies securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Non-U.S. government securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage and asset-backed securities |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity investment in Galapagos |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Publicly traded equity securities |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Deferred compensation plan |  |
Assets: |  |
Equity securities | 0 | 0
Liabilities: |  |
Deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Foreign currency derivative contracts |  |
Assets: |  |
Foreign currency derivative contracts | 0 | 0
Liabilities: |  |
Foreign currency derivative contracts | $ 0 | $ 0

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