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Accounts Receivable and Unbilled Services - Accounts Receivable and Unbilled Services (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Trade:    
Billed $ 998 $ 554
Unbilled services 723 614
Trade accounts receivable and unbilled services, gross 1,721 1,168
Allowance for doubtful accounts (14) (2)
Trade accounts receivable and unbilled services, net $ 1,707 $ 1,166