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Revenue - Major Service Categories (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Revenue	$ 783	$ 731	$ 2,264	$ 2,131
Certification Testing
Revenue from External Customer [Line Items]
Revenue	224	206	628	585
Ongoing Certification Services
Revenue from External Customer [Line Items]
Revenue	252	238	747	705
Non-certification Testing and Other Services
Revenue from External Customer [Line Items]
Revenue	235	220	679	639
Software
Revenue from External Customer [Line Items]
Revenue	$ 72	$ 67	$ 210	$ 202

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