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Contingencies and commitments (Details) - Hospira, Inc. [Member] - USD ($) $ in Millions | Apr. 17, 2020 | Mar. 23, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Amount awarded from settlement |  | $ 70
Subsequent Event [Member] |  |
Loss Contingencies [Line Items] |  |
Amount received from settlement | $ 83 |

X
- Definition Litigation Settlement, Damages Sought, Value + References No definition available. + Details
Name: | amgn_LitigationSettlementDamagesSoughtValue
Namespace Prefix: | amgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | srt_LitigationCaseAxis=amgn_HospiraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |