Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013 Hotel	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	0
Unfunded loan commitments	18
Equity and other potential contributions associated with managed or joint venture properties	92
Equity and other potential contributions associated with managed or joint venture properties expected to be funded within one year	48
Surety bonds issued	82
Range of possible loss, minimum	0
Range of possible loss, maximum	31
VIEs 21 [Member]
Variable Interest Entity [Line Items]
Investment associated with VIEs		109
Number of hotels in which company has an investment		21
VIEs 2 [Member]
Variable Interest Entity [Line Items]
Investment associated with VIEs		5
Number of hotels in which company has an investment		2
VIEs 22 [Member]
Variable Interest Entity [Line Items]
Investment associated with VIEs	121
Loan Balance with VIEs	2
VIEs 1 [Member]
Variable Interest Entity [Line Items]
Investment associated with VIEs	1
Possible cash outlays under contracts with performance guarantee	$ 62