Plan Termination (Details)	12 Months Ended
Dec. 31, 2025
EBP 001
EBP, Plan Termination [Line Items]
EBP, employer contribution, plan termination, vesting percentage	100.00%

EBP, Employer Contribution, Plan Termination, Vesting Percentage

No definition available.

Name:	stm_EBPEmployerContributionPlanTerminationVestingPercentage
Namespace Prefix:	stm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration