Cover - shares	9 Months Ended
	Sep. 30, 2023	Nov. 07, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-41799
Entity Registrant Name	RayzeBio, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-4388509
Entity Address, Address Line One	5505 Morehouse Drive,
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92121
City Area Code	(619)
Local Phone Number	937-2757
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	RYZB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		59,919,502
Entity Central Index Key	0001825367
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023