v3.26.1
Fair Value Measurements - Schedule of Fair Value and NAV (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 604,934,206 $ 570,800,076
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 533,614,450 500,842,496
Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 33,201,277 36,975,032
STMicroelectronics N.V. stock fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,572,676 7,998,463
Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 22,423,772 18,943,213
Common collective trust    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 8,122,031 6,040,872
Total    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 596,812,175 564,759,204
Total | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 533,614,450 500,842,496
Total | Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 33,201,277 36,975,032
Total | STMicroelectronics N.V. stock fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,572,676 7,998,463
Total | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 22,423,772 18,943,213
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 563,262,379 527,784,172
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 533,614,450 500,842,496
Level 1 | Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 1 | STMicroelectronics N.V. stock fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,572,676 7,998,463
Level 1 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 22,075,253 18,943,213
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 33,549,796 36,975,032
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 2 | Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 33,201,277 36,975,032
Level 2 | STMicroelectronics N.V. stock fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 2 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 348,519 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | STMicroelectronics N.V. stock fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
NAV | Common collective trust    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 8,122,031 $ 6,040,872