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Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets |  | $ 9,294 | $ 12,179
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 96,187 | 93,595
Finite-lived intangible assets, accumulated amortization | [1] | (60,175) | (57,033)
Finite-lived intangible assets, net |  | 36,012 | 36,562
Intangible assets, gross carrying amount | [1] | 105,481 | 105,774
Finite-lived intangible assets, accumulated amortization | [1] | (60,175) | (57,033)
Identifiable Intangible Assets, less Accumulated Amortization | [1],[2] | 45,306 | 48,741
Brands [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets |  | 6,909 | 6,929
In Process Research and Development [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | [3] | 2,385 | 5,249
Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | [3] | 92,123 | 89,550
Finite-lived intangible assets, accumulated amortization | [3] | (57,786) | (54,785)
Finite-lived intangible assets, net | [3] | 34,337 | 34,765
Finite-lived intangible assets, accumulated amortization | [3] | (57,786) | (54,785)
Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 2,126 | 2,134
Finite-lived intangible assets, accumulated amortization |  | (1,228) | (1,152)
Finite-lived intangible assets, net |  | 898 | 982
Finite-lived intangible assets, accumulated amortization |  | (1,228) | (1,152)
License Agreements and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 1,938 | 1,911
Finite-lived intangible assets, accumulated amortization |  | (1,160) | (1,096)
Finite-lived intangible assets, net |  | 777 | 815
Finite-lived intangible assets, accumulated amortization |  | $ (1,160) | $ (1,096)
[1] | The decrease in Identifiable intangible assets, less accumulated amortization, is primarily due to amortization, partially offset by additions, mainly consisting of $240 million of Developed technology rights recorded in connection with the EU approval of Mylotarg (see Note 7E).
[2] | Amounts may not add due to rounding.
[3] | 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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