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Contingencies and commitments (AMJEVITA Patent Litigation) (Details)	Jan. 24, 2019 patent
AMJEVITA
Loss Contingencies [Line Items]
Loss contingency, patents allegedly infringed	3

X

- 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

X

- Definition

Number of another entity's patents that the entity has allegedly infringed.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_LitigationCaseAxis=amgn_AMJEVITAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: