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Subsequent Event (Details) - Kirin-Amgen [Member] - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Oct. 30, 2017
Subsequent Event [Line Items] |  |
Percentage of interest acquired, announcement date |  | 50.00%
Forecast [Member] |  |
Subsequent Event [Line Items] |  |
Payments to acquire ownership interest | $ 780 |
Additional payments to acquire ownership interest, sales milestone | $ 30 |

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- Definition Business Acquisition, Percentage of Voting Interests Acquired, Announcement Date + References No definition available. + Details
Name: | amgn_BusinessAcquisitionPercentageofVotingInterestsAcquiredAnnouncementDate
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Payments to Acquire Interest in Joint Venture, Milestone Payments + References No definition available. + Details
Name: | amgn_PaymentstoAcquireInterestinJointVentureMilestonePayments
Namespace Prefix: | amgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + 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: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |