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Revenue - Major Service Categories (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Total revenue	$ 705	$ 670
Certification Testing
Revenue from External Customer [Line Items]
Total revenue	189	176
Ongoing Certification Services
Revenue from External Customer [Line Items]
Total revenue	245	233
Non-certification Testing and Other Services
Revenue from External Customer [Line Items]
Total revenue	203	194
Software
Revenue from External Customer [Line Items]
Total revenue	$ 68	$ 67

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