SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 19	$ 22	$ 19
Provision/reversals Charged to Costs & Expenses	(6)	3	5
Charged to Other Accounts	0	0	0
Deductions	1	6	2
Balance at End of Period	12	19	22
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	26	25	20
Provision/reversals Charged to Costs & Expenses	6	1	5
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	32	$ 26	$ 25
Marketing Applications | Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions	$ 5