Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Percentage inventories valued on a last in, first out (LIFO) basis	34.00%	35.00%
Total inventories valued on an average-cost basis	$ 691	$ 770
Recognition of income caused by partial liquidations of the lower cost LIFO inventory base, gross	26	1	2
Recognition of income caused by partial liquidations of the lower cost LIFO inventory base, after tax	$ 17	$ 1	$ 1