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Contingencies and commitments (Lease Commitments, Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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