Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014 Fair Value, Inputs, Level 1	Jun. 30, 2014 Commercial Paper	Jun. 30, 2014 Mandatorily Redeemable Preferred Equity Ownership Interest Debt Securities hotel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of our marketable securities		$ 41
Held-to-maturity securities				65
Number of hotels				3
Held-to-maturity securities, amortized cost basis				73
Held-to-maturity securities, fair value				73
Proceeds from sale of investment	22
Amortized cost basis	14
Realized gain from sale of investment	$ 8
Commercial paper, maturity term (generally 30 days or less)			30 days