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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 - Medivation, Inc. (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Sep. 28, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017
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 | $ 55,952 | [2]
Medivation [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) |  | $ 81.5 |  |  |  |  |  |  |
Payments to acquire businesses, cash portion |  | $ 14,300 |  |  |  |  |  |  |
Cash payments for acquisition, net of cash acquired |  | 13,900 |  |  |  |  |  |  |
Acquisition consideration, amount payable |  |  |  |  |  |  | $ 365 |  |
Intangible assets |  | 12,200 |  |  |  |  |  |  |
Goodwill |  | 6,100 |  |  |  |  |  |  |
Net deferred tax liabilities |  | 4,000 |  |  |  |  |  |  |
Assumed contingent consideration |  | 259 |  |  |  |  |  |  |
Contingent consideration paid |  |  | $ 35 |  |  |  |  |  |
Reduction in identifiable intangible assets |  |  |  |  |  |  |  | $ 1,000 |
Decrease in amortization of intangible assets |  |  |  |  | $ 38 |  |  |  |
Developed Technology Rights [Member] | Medivation [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 8,100 |  |  |  |  |  |  |
Acquired intangible assets, useful life |  | 12 years |  |  |  |  |  |  |
In Process Research and Development [Member] | Medivation [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 4,100 |  |  |  |  |  |  |
[1] | Amounts may not add due to rounding.
[2] | Amounts may not add due to rounding.

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