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Document and Entity Information - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 02, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act File Number 001-39845    
Entity Registrant Name SES AI Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 88-0641865    
Entity Address, Address Line One 35 Cabot Road    
Entity Address, City or Town Woburn    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01801    
City Area Code 339    
Local Phone Number 298-8750    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Central Index Key 0001819142    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 278.5
Auditor Name GRANT THORNTON LLP    
Auditor Firm ID 248    
Auditor Location Boston, Massachusetts    
Documents Incorporated by Reference [Text Block]

The registrant intends to file a proxy statement pursuant to Regulation 14A within 120 days of the end of the fiscal year ended December 31, 2025. Portions of such proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Common Class A      
Document Information [Line Items]      
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Entity Listing, Par Value Per Share $ 0.0001    
Trading Symbol SES    
Security Exchange Name NYSE    
Entity Common Stock, Shares Outstanding   322,742,539  
Common Class B      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   43,881,251  
Warrant      
Document Information [Line Items]      
Title of 12(b) Security Warrants to purchase one share of Class A common stock,each at an exercise price of $11.50    
Trading Symbol SES WS    
Security Exchange Name NYSE