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Business combinations (Tables) | 3 Months Ended
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Mar. 31, 2018
Business Combinations [Abstract] |
Aggregate acquisition date consideration to acquire an entity | The aggregate share acquisition date consideration to acquire the remaining 50% ownership in K-A and the fair value of Amgen’s preacquisition investment consisted of the following (in millions):
|  | Amount
Total cash paid to Kirin |  | $ | 780 |
Fair value of contingent consideration obligation |  | 45 |
Loss on settlement of preexisting relationship |  | (168 | )
Total consideration transferred to acquire K-A |  | 657 |
Fair value of Amgen’s investment in K-A |  | 825 |
Total acquisition date fair value |  | $ | 1,482 |

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- Definition Tabular disclosure of the aggregate acquisition date consideration to acquire an entity. + References No definition available. + Details
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Namespace Prefix: | amgn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration