v3.26.1
Revenue - Major Service Categories (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenue from External Customer [Line Items]    
Revenue $ 758 $ 705
Certification Testing    
Revenue from External Customer [Line Items]    
Revenue 211 189
Ongoing Certification Services    
Revenue from External Customer [Line Items]    
Revenue 265 245
Non-certification Testing and Other Services    
Revenue from External Customer [Line Items]    
Revenue 209 203
Software    
Revenue from External Customer [Line Items]    
Revenue $ 73 $ 68