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Revenue
 3 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
The table below summarizes the major service categories from which the Company derives its revenues:
Three Months Ended
March 31,
(in millions)20252024
Certification Testing$189 $176 
Ongoing Certification Services245 233 
Non-certification Testing and Other Services203 194 
Software68 67 
Total $705 $670 
Contract Balances
The revenue recognized during the three months ended March 31, 2025, which was included in contract liabilities at December 31, 2024, amounted to $36 million. The revenue recognized during the three months ended March 31, 2024, which was included in contract liabilities at December 31, 2023, amounted to $30 million.
Remaining Performance Obligations
At March 31, 2025, the Company estimates that $201 million in revenue is expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period. The Company expects to recognize approximately 62% of its unsatisfied (or partially unsatisfied) performance obligations as revenue in the subsequent 12 months, with the remaining balance to be recognized thereafter.
Remaining consideration from contracts with customers is included in the amount presented above and includes contracts with multiple performance obligations and multi-year maintenance agreements, which are typically recognized as the performance obligation is satisfied.