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Financial Instruments - Other Noncurrent Liabilities (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2017 | Aug. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Jul. 01, 2018 | Dec. 31, 2018 | Aug. 31, 2018 | Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  | $ 36,562 |  |  |  |  | $ 31,045 |  |
Mylotarg [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  | 10 years |  |  |  |  |  |  |  |
Aggregate amount of guaranteed fixed annual payments to be made in connection with research and development arrangement |  | $ 301 |  |  |  |  |  |  |  |
Bosulif [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  |  |  |  |  |  |  | 9 years |  |
Bosulif [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  |  | 10 years |  |  |  |  |  |  |
Aggregate amount of guaranteed fixed annual payments to be made in connection with research and development arrangement |  |  | $ 416 |  |  |  |  | $ 240 |  |
Besponsa [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  |  |  |  |  |  |  | 8 years |  |
Aggregate amount of guaranteed fixed annual payments to be made in connection with research and development arrangement |  |  |  |  |  |  |  | $ 422 |  |
Besponsa [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  |  |  |  | 9 years |  |  |  |  |
Aggregate amount of guaranteed fixed annual payments to be made in connection with research and development arrangement |  |  |  |  | $ 148 |  |  |  |  |
Besponsa [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development arrangement, aggregate payment obligation, term |  |  |  | 9 years |  |  |  |  |  |
Aggregate amount of guaranteed fixed annual payments to be made in connection with research and development arrangement |  |  |  | $ 296 |  |  |  |  |  |
Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net | [1] |  | 34,765 |  |  |  |  | 30,535 |  |
Developed Technology Rights [Member] | Mylotarg [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | $ 240 |  |  |  |  |  |  |  |
Lump sum payment for liability buyout |  |  |  |  |  |  |  |  |  | $ 224
Non-cash gain from buyout transaction |  |  |  |  |  |  | $ 17 | 17 |  |
Developed Technology Rights [Member] | Bosulif [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  | $ 364 |  |  |  |  | 209 |  |
Lump sum payment for liability buyout |  |  |  |  |  |  |  |  | $ 71 |
Non-cash gain from buyout transaction |  |  |  |  |  | $ 9 |  |  |  |
Developed Technology Rights [Member] | Besponsa [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  | $ 123 |  |  | 122 |  |
Developed Technology Rights [Member] | Besponsa [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  | $ 248 |  |  |  | 243 |  |
Other Noncurrent Liabilities [Member] | Developed Technology Rights [Member] | Bosulif [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | 186 |  |
Other Noncurrent Liabilities [Member] | Developed Technology Rights [Member] | Besponsa [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | 119 |  |
Other Noncurrent Liabilities [Member] | Developed Technology Rights [Member] | Besponsa [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | 235 |  |
Other current liabilities [Member] | Developed Technology Rights [Member] | Bosulif [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | 23 |  |
Other current liabilities [Member] | Developed Technology Rights [Member] | Besponsa [Member] | EU [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | 3 |  |
Other current liabilities [Member] | Developed Technology Rights [Member] | Besponsa [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  |  |  |  |  |  | $ 7 |  |
[1] | 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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