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Business Combinations and Divestitures - Purchase Price Allocation of Identifiable Intangible Assets (Details) - USD ($) $ in Millions |  | 9 Months Ended
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Jun. 16, 2017 | Sep. 30, 2018
Actelion |  |
Business Acquisition [Line Items] |  |
Total intangible assets | $ 25,010 |
Actelion | In-process research and development |  |
Business Acquisition [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | 780 |
Actelion | Patents and trademarks |  |
Business Acquisition [Line Items] |  |
Total amortizable intangibles | $ 24,230 |
Valchlor | Patents and trademarks |  |
Business Acquisition [Line Items] |  |
Total amortizable intangibles |  | $ 400

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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