v3.26.1

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	Apr. 30, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-37686
Entity Registrant Name	BEONE MEDICINES LTD.
Entity Incorporation, State or Country Code	V8
Entity Tax Identification Number	98-1209416
Entity Address, Street Address	c/o BeOne Medicines I GmbH
Entity Address, Street Address Two	Aeschengraben 27
Entity Address, City	Basel
Entity Address, Country	CH
Entity Address, Postal Zip Code	4051
City Area Code	61
Local Phone Number	685 19 00
Title of each class	American Depositary Shares, each representing 13 Ordinary Shares, par value $0.0001 per share
Trading Symbol(s)	ONC
Name of each exchange on which registered	NASDAQ
Entity Common Stock, Shares Outstanding		1,445,262,342
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 Central Index Key	0001651308
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1

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Local phone number for entity.

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BeOne Medicines Ltd. 10-Q