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Subsequent Event (Details) - Kirin-Amgen [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Oct. 30, 2017
Subsequent Event [Line Items]
Percentage of interest acquired, announcement date		50.00%
Forecast [Member]
Subsequent Event [Line Items]
Payments to acquire ownership interest	$ 780
Additional payments to acquire ownership interest, sales milestone	$ 30

X

- Definition

Business Acquisition, Percentage of Voting Interests Acquired, Announcement Date

+ References

No definition available.

+ Details

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Namespace Prefix:	amgn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Payments to Acquire Interest in Joint Venture, Milestone Payments

+ References

No definition available.

+ Details

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Namespace Prefix:	amgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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