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Acquisitions, Research Collaborations and License Agreements - Fair Value of Assets Acquired and Liabilities Assumed (Details) $ in Millions | Apr. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Goodwill |  | $ 19,490 | $ 18,253
Minimum |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Useful lives of identifiable intangible assets | 18 years |  |
Maximum |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Useful lives of identifiable intangible assets | 24 years |  |
Antelliq |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Cash and cash equivalents | $ 31 |  |
Accounts receivable | 73 |  |
Inventories | 97 |  |
Property, plant and equipment | 62 |  |
Identifiable intangible assets (useful lives ranging from 18-24 years) (1) | 2,689 |  |
Deferred income tax liabilities | (563) |  |
Other assets and liabilities, net | (81) |  |
Total identifiable net assets | 2,308 |  |
Goodwill | 1,343 |  |
Consideration transferred | $ 3,651 |  |
Measurement Input, Discount Rate | Antelliq |  |  |
Acquisitions Research Collaborations And License Agreements Transactions [Line Items] |  |  |
Present value discount rate | 0.115 |  |

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