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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
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 Street #49404    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94104    
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 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001832415    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Shell Company false    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol BTTX    
Security Exchange Name NASDAQ    
Entity Public Float     $ 61,280,800
Entity Common Stock, Shares Outstanding   23,608,600  
Documents Incorporated by Reference

Certain portions of the registrant's definitive proxy statement relating the Company's Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

   
Auditor Firm ID 149    
Auditor Name Elliott Davis, LLC    
Auditor Location Greenville, South Carolina