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Segment information (Details Textual) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 segment | Dec. 31, 2017 segment customer | Dec. 31, 2016 customer | Dec. 31, 2015 customer
Segment Reporting Information [Line Items] |  |  |  |
Number of business segment | segment | 1 | 1 |  |
Number of major customers (as defined) accounting for more than 10% of total revenue |  | 3 | 3 | 3
Threshold as a percentage of total revenues for determining a major customer for additional disclosures |  | 10.00% | 10.00% | 10.00%
Percentage of worldwide gross revenues derived from major customers (as defined) on a combined basis |  | 81.00% |  |
Percentage of United States gross product sales derived from major customers (as defined) on a combined basis |  | 96.00% |  |
Major customers (as defined) accounting for more than 10% of gross trade receivables |  | 3 | 3 |
Combined trade receivables for all major customers (as defined) as a percentage of net trade receivables |  | 75.00% | 76.00% |
Percentage of net trade receivables due from customers located outside the United States, primarily in Europe |  | 14.00% | 21.00% |
AmerisourceBergen Corporation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amount due from major customer (as defined) as a percentage of gross trade receivables |  | exceeded 10% | exceeded 10% |
McKesson Corporation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amount due from major customer (as defined) as a percentage of gross trade receivables |  | exceeded 10% | exceeded 10% |
Cardinal Health, Inc. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amount due from major customer (as defined) as a percentage of gross trade receivables |  | exceeded 10% | exceeded 10% |

X
- Definition Major customers (as defined) accounting for more than 10% of gross trade receivables. + References No definition available. + Details
Name: | amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfGrossTradeReceivables
Namespace Prefix: | amgn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of major customers (as defined) accounting for more than 10% of total revenue. + References No definition available. + Details
Name: | amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue
Namespace Prefix: | amgn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of United States gross product sales derived from major customers (as defined) on a combined basis. + References No definition available. + Details
Name: | amgn_PercentageOfCombinedGrossProductSalesFromMajorCustomers
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Combined trade receivables for all major customers (as defined) as a percentage of net trade receivables. + References No definition available. + Details
Name: | amgn_PercentageOfCombinedNetTradeReceivablesFromMajorCustomers
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of worldwide gross revenues derived from major customers (as defined) on a combined basis. + References No definition available. + Details
Name: | amgn_PercentageOfCombinedWorldwideGrossRevenuesFromMajorCustomers
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of net trade receivables due from customers located outside the United States, primarily in Europe. + References No definition available. + Details
Name: | amgn_PercentageOfNetAmountDueFromCustomersLocatedOutsideDomesticLocation
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount due from major customer (as defined) as a percentage of gross trade receivables. + References No definition available. + Details
Name: | amgn_ThresholdForDisclosureOfAmountsDueFromMajorCustomers
Namespace Prefix: | amgn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold as a percentage of total revenues for determining a major customer for additional disclosures. + References No definition available. + Details
Name: | amgn_ThresholdForDisclosureOfProductSalesToMajorCustomers
Namespace Prefix: | amgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_SegmentReportingInformationLineItems
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: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=amgn_CustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=amgn_CustomerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |