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Trade Accounts Receivable, Unbilled Services and Unearned Income - Trade Accounts Receivable and Unbilled Services (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Receivables, Net, Current [Abstract]    
Trade accounts receivable $ 1,349 $ 1,329
Unbilled services 1,905 1,624
Trade accounts receivable and unbilled services 3,254 2,953
Allowance for doubtful accounts (27) (36)
Trade accounts receivable and unbilled services, net $ 3,227 $ 2,917