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Acquisitions, Divestitures, Assets and Liabilities Held for Sale, Licensing Arrangements, Research and Development and Collaborative Arrangements, Equity-Method Investments and Privately Held Investment - Anacor Pharmaceuticals, Inc. (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 24, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payments for acquisition, net of cash acquired | [1] |  | $ 0 |  | $ 1,000 |  | $ 18,368
Goodwill |  |  | $ 53,411 | [2] | $ 55,952 | [2] | $ 54,449
Anacor [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) |  | $ 99.25 |  |  |  |  |
Payments to acquire businesses, cash portion |  | $ 4,900 |  |  |  |  |
Cash payments for acquisition, net of cash acquired |  | 4,500 |  |  |  |  |
Debt assumed |  | 698 |  |  |  |  |
Indefinite-lived intangible assets |  | 4,900 |  |  |  |  |
Goodwill |  | 646 |  |  |  |  |
Net deferred tax liabilities |  | 346 |  |  |  |  |
In Process Research and Development [Member] | Anacor [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets |  | $ 4,800 |  |  |  |  |
[1] | Amounts may not add due to rounding.
[2] | Amounts may not add due to rounding.

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