Receivables, Net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance For Doubtful Accounts Receivable Rollforward
Beginning balance	$ 38	$ 19	$ 22
Additions charged to costs and expenses	17	27	4
Charge-offs and other	(21)	(8)	(7)
Ending balance	$ 34	$ 38	$ 19