Rent Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Minimum rentals on operating leases	$ 45	$ 46	$ 45
Additional rentals based on sales	38	38	38
Less: sublease rentals	(1)	(1)	(2)
Operating Leases, Rent Expense, Total	$ 82	$ 83	$ 81