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

Amount of non current assets sold without recourse.

No definition available.

Name:	stm_AmountOfNonCurrentAssetsSoldWithoutRecourse
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant