Statement Of Changes In Equity [Abstract]

STMicroelectronics - Filing #5829965

Concept	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Increase (decrease) through change in equity of subsidiaries, equity	104,000,000 USD	104,000,000 USD	— USD	— USD	— USD	— USD	— USD	— USD	— USD	52,000,000 USD	— USD	— USD	52,000,000 USD	— USD	— USD	— USD
Purchase of treasury shares	— USD	359,000,000 USD	— USD	— USD	359,000,000 USD	— USD	— USD	359,000,000 USD	— USD	346,000,000 USD	346,000,000 USD	— USD	— USD	— USD	346,000,000 USD	— USD