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Fair Value Measurements - Summary of Assets and Liabilities Recorded at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Mar. 04, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Assets |  |  |
Available-for-sale debt securities | $ 2,497 |  | $ 2,026
Other publicly traded equity securities |  |  |
Assets |  |  |
Total | 5,743 |  | 6,970
Fair value, recurring | Fair value |  |  |
Assets |  |  |
Total | 8,320 |  | 9,008
Liabilities: |  |  |
Total | 583 |  | 339
Fair value, recurring | Fair value | MYR |  |  |
Liabilities: |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 317 |  | 0
Fair value, recurring | Fair value | U.S. treasury securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 407 |  | 309
Fair value, recurring | Fair value | U.S. government agencies securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 4 |  | 0
Fair value, recurring | Fair value | Non-U.S. government securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 50 |  | 43
Fair value, recurring | Fair value | Certificates of deposit |  |  |
Assets |  |  |
Available-for-sale debt securities | 249 |  | 216
Fair value, recurring | Fair value | Corporate debt securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 1,363 |  | 1,142
Fair value, recurring | Fair value | Residential mortgage and asset-backed securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 424 |  | 316
Fair value, recurring | Fair value | Money market funds |  |  |
Assets |  |  |
Marketable equity securities | 3,661 |  | 4,361
Fair value, recurring | Fair value | Other publicly traded equity securities |  |  |
Assets |  |  |
Marketable equity securities | 331 |  | 531
Fair value, recurring | Fair value | Other publicly traded equity securities | Galapagos |  |  |
Assets |  |  |
Marketable equity securities | 931 |  | 1,648
Fair value, recurring | Fair value | Other publicly traded equity securities | Arcus |  |  |
Assets |  |  |
Marketable equity securities | 559 |  | 212
Fair value, recurring | Fair value | Deferred compensation plan |  |  |
Assets |  |  |
Marketable equity securities | 261 |  | 218
Liabilities: |  |  |
Deferred compensation plan | 261 |  | 218
Fair value, recurring | Fair value | Foreign currency derivative contracts |  |  |
Assets |  |  |
Foreign currency derivative contracts | 80 |  | 12
Liabilities: |  |  |
Foreign currency derivative contracts | 5 |  | 121
Fair value, recurring | Level 1 |  |  |
Assets |  |  |
Total | 6,150 |  | 7,279
Liabilities: |  |  |
Total | 261 |  | 218
Fair value, recurring | Level 1 | MYR |  |  |
Liabilities: |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 0 |  | 0
Fair value, recurring | Level 1 | U.S. treasury securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 407 |  | 309
Fair value, recurring | Level 1 | U.S. government agencies securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 1 | Non-U.S. government securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 1 | Certificates of deposit |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 1 | Corporate debt securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 1 | Residential mortgage and asset-backed securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 1 | Money market funds |  |  |
Assets |  |  |
Marketable equity securities | 3,661 |  | 4,361
Fair value, recurring | Level 1 | Other publicly traded equity securities |  |  |
Assets |  |  |
Marketable equity securities | 331 |  | 531
Fair value, recurring | Level 1 | Other publicly traded equity securities | Galapagos |  |  |
Assets |  |  |
Marketable equity securities | 931 |  | 1,648
Fair value, recurring | Level 1 | Other publicly traded equity securities | Arcus |  |  |
Assets |  |  |
Marketable equity securities | 559 |  | 212
Fair value, recurring | Level 1 | Deferred compensation plan |  |  |
Assets |  |  |
Marketable equity securities | 261 |  | 218
Liabilities: |  |  |
Deferred compensation plan | 261 |  | 218
Fair value, recurring | Level 1 | Foreign currency derivative contracts |  |  |
Assets |  |  |
Foreign currency derivative contracts | 0 |  | 0
Liabilities: |  |  |
Foreign currency derivative contracts | 0 |  | 0
Fair value, recurring | Level 2 |  |  |
Assets |  |  |
Total | 2,170 |  | 1,729
Liabilities: |  |  |
Total | 5 |  | 121
Fair value, recurring | Level 2 | MYR |  |  |
Liabilities: |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 0 |  | 0
Fair value, recurring | Level 2 | U.S. treasury securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 2 | U.S. government agencies securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 4 |  | 0
Fair value, recurring | Level 2 | Non-U.S. government securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 50 |  | 43
Fair value, recurring | Level 2 | Certificates of deposit |  |  |
Assets |  |  |
Available-for-sale debt securities | 249 |  | 216
Fair value, recurring | Level 2 | Corporate debt securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 1,363 |  | 1,142
Fair value, recurring | Level 2 | Residential mortgage and asset-backed securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 424 |  | 316
Fair value, recurring | Level 2 | Money market funds |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 2 | Other publicly traded equity securities |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 2 | Other publicly traded equity securities | Galapagos |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 2 | Other publicly traded equity securities | Arcus |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 2 | Deferred compensation plan |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Liabilities: |  |  |
Deferred compensation plan | 0 |  | 0
Fair value, recurring | Level 2 | Foreign currency derivative contracts |  |  |
Assets |  |  |
Foreign currency derivative contracts | 80 |  | 12
Liabilities: |  |  |
Foreign currency derivative contracts | 5 |  | 121
Fair value, recurring | Level 3 |  |  |
Assets |  |  |
Total | 0 |  | 0
Liabilities: |  |  |
Total | 317 |  | 0
Fair value, recurring | Level 3 | MYR |  |  |
Liabilities: |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 317 | $ 341 | 0
Fair value, recurring | Level 3 | U.S. treasury securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | U.S. government agencies securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | Non-U.S. government securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | Certificates of deposit |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | Corporate debt securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | Residential mortgage and asset-backed securities |  |  |
Assets |  |  |
Available-for-sale debt securities | 0 |  | 0
Fair value, recurring | Level 3 | Money market funds |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 3 | Other publicly traded equity securities |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 3 | Other publicly traded equity securities | Galapagos |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 3 | Other publicly traded equity securities | Arcus |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Fair value, recurring | Level 3 | Deferred compensation plan |  |  |
Assets |  |  |
Marketable equity securities | 0 |  | 0
Liabilities: |  |  |
Deferred compensation plan | 0 |  | 0
Fair value, 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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