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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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