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Other Non-Current Assets - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Investments, All Other Investments [Abstract] |  |
Non-current assets sold without recourse | $ 87 | $ 118
Non-current assets sold , cost | $ 4 | $ 5

X
- Definition Amount of non current assets sold without recourse. + References No definition available. + Details
Name: | stm_AmountOfNonCurrentAssetsSoldWithoutRecourse
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cost of non current assets sold without recourse. + References No definition available. + Details
Name: | stm_CostOfNonCurrentAssetsSoldWithoutRecourse
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAllOtherInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration