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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 28, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-39845    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Registrant Name SES AI Corporation    
Entity Central Index Key 0001819142    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-1567584    
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 Filer Category Non-accelerated Filer    
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 Ex Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 280.6
Auditor Name WithumSmith+Brown, PC    
Auditor Firm ID 100    
Auditor Location New York, New York    
Class A Ordinary shares      
Document Information [Line Items]      
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Trading Symbol SES    
Security Exchange Name NYSE    
Entity Common Stock, Shares Outstanding   303,989,794  
Class B Ordinary share      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   43,881,251  
Warrants      
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