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Contingencies and commitments (Lease Commitments, Textual) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |
Future rental commitments for abandoned leases | $ 222 |  |
Future rental income relating to noncancelable subleases of abandoned facilities | 203 |  |
Rental expense on operating leases | $ 166 | $ 159 | $ 134

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- Definition Future rental commitments for abandoned leases. + References No definition available. + Details
Name: | amgn_FutureRentalCommitmentsForAbandonedLeases
Namespace Prefix: | amgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental expense incurred for assets leased under operating leases including furniture and equipment included in operating expenses. + References No definition available. + Details
Name: | amgn_RentalExpenseOnOperatingLeases
Namespace Prefix: | amgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant