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Revenue
 9 Months Ended
Sep. 30, 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
September 30,		Nine Months Ended
September 30,
(in millions)2025202420252024
Certification Testing$224 $206 $628 $585 
Ongoing Certification Services252 238 747 705 
Non-certification Testing and Other Services235 220 679 639 
Software72 67 210 202 
Total $783 $731 $2,264 $2,131 
Contract Balances
The revenue recognized during the three and nine months ended September 30, 2025, which was included in contract liabilities at December 31, 2024, amounted to $25 million and $112 million, respectively. The revenue recognized during the three and nine months ended September 30, 2024, which was included in contract liabilities at December 31, 2023, amounted to $27 million and $106 million, respectively.
Remaining Performance Obligations
At September 30, 2025, the Company estimates that $189 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 63% 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.