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Stockholders' Equity - Common Stock Available for Future Issuance (Details) - shares | Sep. 30, 2022 | Feb. 02, 2022 | Dec. 31, 2021
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Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 70,449,992 |  | 237,569,857
Redeemable Convertible Preferred Stock [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) |  |  | 213,960,286
Common Stock Warrants [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) |  | 14,213,280 |
Common Stock Warrants, Public Warrants [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 9,199,947 |  |
Common Stock Warrants, Private Warrants [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 5,013,333 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 18,724,863 |  | 20,747,909
Restricted Stock Units (RSUs) [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 2,755,058 |  |
Performance Shares [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 2,116,942 |  |
Restricted Stock [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) |  |  | 2,261,880
SES AI Corporation 2021 Plan [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) | 32,639,849 | 36,862,002 |
SES Holdings Pte. Ltd. 2021 Plan [Member] |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock available for future issuance (in shares) |  |  | 599,782

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