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Revenue - Major Service Categories (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from External Customer [Line Items]      
Total $ 2,870 $ 2,678 $ 2,520
Certification Testing      
Revenue from External Customer [Line Items]      
Total 784 718 657
Ongoing Certification Services      
Revenue from External Customer [Line Items]      
Total 953 874 828
Non-certification Testing and Other Services      
Revenue from External Customer [Line Items]      
Total 860 812 769
Software      
Revenue from External Customer [Line Items]      
Total $ 273 $ 274 $ 266