Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013 Hotel	Sep. 30, 2012	Dec. 31, 2012 Hotel
Variable Interest Entity [Line Items]
Total number of hotels in which company has variable interest entity	23		23
Number of hotels in which company has an investment	22
Loans to owners	$ 3
Unfunded loan commitments expected to be funded in total	18
Unfunded loan commitments	0
Equity and other potential contributions associated with managed or joint venture properties	99
Equity and other potential contributions associated with managed or joint venture properties expected to be funded within one year	48
Surety bonds issued	83
Payment to retain a management contract	3
Range of possible loss, minimum	0
Range of possible loss, maximum	32
Favorable adjustment to a legal reserve	22	11
VIEs 21
Variable Interest Entity [Line Items]
Investment associated with VIEs			109
Number of hotels in which company has an investment			21
VIEs 2
Variable Interest Entity [Line Items]
Investment associated with VIEs			5
Number of hotels in which company has an investment			2
VIEs 22
Variable Interest Entity [Line Items]
Investment associated with VIEs	119
Loan balance with VIEs	2
VIEs 1
Variable Interest Entity [Line Items]
Investment associated with VIEs	1
Possible cash outlays under contracts with performance guarantee	$ 62