v3.26.3
Cover - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Sep. 25, 2026
Dec. 31, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Amendment Flag false    
Entity Registrant Name SUNHYDROGEN, INC.    
Entity Central Index Key 0001481028    
Document Period End Date Jun. 30, 2026    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Entity Tax Identification Number 26-4298300    
Current Fiscal Year End Date --06-30    
Entity File Number 000-54437    
Entity Incorporation, State or Country Code NV    
Entity Address, Address Line One BioVentures Center    
Entity Address, Address Line Two 2500 Crosspark Road    
Entity Address, City or Town Coralville    
Entity Address, State or Province IA    
Entity Address, Postal Zip Code 52241    
City Area Code (805)    
Local Phone Number 966-6566    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
ICFR Auditor Attestation Flag false    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Common Stock, Shares Outstanding   5,749,164,916  
Entity Public Float     $ 147
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference [Text Block] None