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Revenues - Unbilled Receivables (Detail) - Accounts Receivable - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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MA |  |
Disaggregation of Revenue [Line Items] |  |
Unbilled Receivables | $ 114 | $ 122
MIS |  |
Disaggregation of Revenue [Line Items] |  |
Unbilled Receivables | $ 530 | $ 426

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