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Receivables, Net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance For Doubtful Accounts Receivable Rollforward      
Beginning balance $ 29 $ 34 $ 38
Additions charged to expenses 2 3 17
Charge-offs and other (4) (8) (21)
Ending balance $ 27 $ 29 $ 34