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Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | $ 91,788 | $ 93,595
Finite-lived intangible assets, accumulated amortization | [1] | (60,743) | (57,033)
Finite-lived intangible assets, less accumulated amortization |  | 31,045 | 36,562
Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets |  | 4,165 | 12,179
Intangible assets, gross carrying amount | [1] | 95,954 | 105,774
Identifiable Intangible Assets, less Accumulated Amortization | [1],[2] | 35,211 | 48,741
Brands [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | [3] | 1,994 | 6,929
In Process Research and Development [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | [3] | 2,171 | 5,249
Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | [3] | 89,430 | 89,550
Finite-lived intangible assets, accumulated amortization | [3] | (58,895) | (54,785)
Finite-lived intangible assets, less accumulated amortization | [3] | 30,535 | 34,765
Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | [3] | 923 | 2,134
Finite-lived intangible assets, accumulated amortization | [3] | (708) | (1,152)
Finite-lived intangible assets, less accumulated amortization | [3] | 215 | 982
Licensing Agreements And Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount |  | 1,436 | 1,911
Finite-lived intangible assets, accumulated amortization |  | (1,140) | (1,096)
Finite-lived intangible assets, less accumulated amortization |  | $ 296 | $ 815
[1] | The decrease in Identifiable intangible assets, less accumulated amortization, is primarily due to the reclassification of $5.8 billion of intangible assets, net, ($6.3 billion total gross carrying amount) to Assets held for sale during the fourth quarter of 2018 (see Note 2C) and amortization and impairments, 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, Brands, Brands and other and IPR&D primarily reflect (i) the reclassification of $6.1 billion of Brands and Brands and other to Assets held for sale during the fourth quarter of 2018 (see Note 2C), (ii) 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 (see Note 2A), (iii) $240 million of Developed technology rights recorded in connection with the EU approval of Mylotarg (see Note 7E), as well as impairments of $2.9 billion of Developed technology rights (see Note 4).

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