v3.25.1

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2025	Apr. 28, 2025
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
Document Transition Report	false
Entity File Number	001-37702
Entity Registrant Name	Amgen Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-3540776
Entity Address, Address Line One	One Amgen Center Drive
Entity Address, City or Town	Thousand Oaks
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91320-1799
City Area Code	805
Local Phone Number	447-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		537,706,118
Entity Central Index Key	0000318154
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Document Fiscal Period Focus	--12-31
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common stock, $0.0001 par value
Trading Symbol	AMGN
Security Exchange Name	NASDAQ
2.00% Senior Notes due 2026
Entity Information [Line Items]
Title of 12(b) Security	2.00% Senior Notes due 2026
Trading Symbol	AMGN26
Security Exchange Name	NASDAQ

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Local phone number for entity.

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AMGEN INC 10-Q