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Accounts Receivable And Unbilled Revenue - Summary of Movement in Allowance For Doubtful Accounts (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Beginning balance $ 9 $ 6
Impairment provision additions on receivables 2 1
Amounts settled and derecognized during the period   2
Ending balance $ 11 $ 9