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Contingencies and commitments (Details) - patent | Jun. 30, 2020 | May 08, 2020
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Loss Contingencies [Line Items] |  |
Number of asserted patents expired |  | 3
Humira Biosimilar Antitrust Class Actions [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, appeal period | 30 days |

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- Definition Loss Contingency, appeal period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Loss Contingency, Patents Expired, Number + References No definition available. + Details
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Namespace Prefix: | amgn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |