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Revenues - Unbilled Receivables (Detail) - Accounts Receivable - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
MA    
Disaggregation of Revenue [Line Items]    
Unbilled Receivables $ 119 $ 119
MIS    
Disaggregation of Revenue [Line Items]    
Unbilled Receivables $ 470 $ 415