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Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets (Detail) - USD ($) $ in Millions | Oct. 01, 2017 | Dec. 31, 2016
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Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets |  | $ 12,229 | $ 16,984
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 93,650 | 87,351
Finite-lived intangible assets, accumulated amortization | [1] | (56,158) | (51,687)
Finite-lived Intangible Assets, less Accumulated Amortization |  | 37,492 | 35,664
Intangible assets, gross carrying amount | [1] | 105,879 | 104,335
Finite-lived intangible assets, accumulated amortization | [1] | (56,158) | (51,687)
Identifiable Intangible Assets, less Accumulated Amortization | [1],[2] | 49,721 | 52,648
Brands [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets |  | 6,937 | 6,883
In Process Research and Development [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | [3] | 5,292 | 10,101
Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | [3] | 89,585 | 83,390
Finite-lived intangible assets, accumulated amortization | [3] | (53,960) | (49,650)
Finite-lived Intangible Assets, less Accumulated Amortization | [3] | 35,625 | 33,740
Finite-lived intangible assets, accumulated amortization | [3] | (53,960) | (49,650)
Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 2,135 | 2,092
Finite-lived intangible assets, accumulated amortization |  | (1,127) | (1,032)
Finite-lived Intangible Assets, less Accumulated Amortization |  | 1,008 | 1,060
Finite-lived intangible assets, accumulated amortization |  | (1,127) | (1,032)
License Agreements and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 1,930 | 1,869
Finite-lived intangible assets, accumulated amortization |  | (1,071) | (1,005)
Finite-lived Intangible Assets, less Accumulated Amortization |  | 859 | 864
Finite-lived intangible assets, accumulated amortization |  | $ (1,071) | $ (1,005)
[1] | The decrease in I dentifiable intangible assets, less accumulated amortization, is primarily due to amortization, measurement period adjustments related to Medivation (see Note 2A), as well as impairments of Developed technology rights (see Note 4), partially offset by assets acquired as part of the acquisition of AstraZeneca’s small molecule anti-infectives business (see Note 2A) and the assets recorded in connection with the EU and U.S. approvals of Besponsa (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 $4.8 billion from IPR&D to Developed technology rights to reflect the approval of Eucrisa, (ii) the Developed technology rights and IPR&D acquired as part of the acquisition of AstraZeneca’s small molecule anti-infectives business (see Note 2A), (iii) the Developed technology rights of $371 million recorded in connection with the EU and U.S. approvals of Besponsa (see Note 7E), partially offset by (iv) measurement period adjustments related to Medivation (see Note 2A) and (v) impairments of Developed technology rights (see Note 4).

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