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Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets - Footnotes (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, net |  | $ 36,012 |  | $ 36,562
Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, net | [1] | 34,337 |  | $ 34,765
Xtandi [Member] | Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Transfer of intangible assets |  | 2,700 |  |
EU [Member] | Mylotarg [Member] | Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, net |  |  | $ 240 |
In Process Research and Development [Member] | Xtandi [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Transfer of intangible assets |  | $ (2,700) |  |
[1] | The changes in the gross carrying amount of Developed technology rights and IPR&D primarily reflect (i) the transfer of $2.7 billion from IPR&D to Developed technology rights to reflect the approval of Xtandi in the U.S. for the treatment of men with non-metastatic castration-resistant prostate cancer, which is being developed through a collaboration with Astellas, and (ii) $240 million of Developed technology rights recorded in connection with the EU approval of Mylotarg (see Note 7E).

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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