Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 10, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2022
Entity File Number	001-39864
Entity Registrant Name	BETTER THERAPEUTICS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3472546
Entity Address, Address Line One	548 Market St. #49404
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94101
City Area Code	(415)
Local Phone Number	887-2311
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001832415
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	BTTX
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		23,609,890