Plant, Property and Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Purchases of plant, property and equipment	$ 364	$ 362	$ 385
Unamortized capitalized software costs	178	154
Amortization of capitalized software costs	35	33	32
Hotels [Member]
Property, Plant and Equipment [Line Items]
Purchases of plant, property and equipment	$ 12