Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013 hotel	Dec. 31, 2014 hotel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale of investment	$ 22
Amortized cost basis	14
Realized gain from sale of investment	8
Held-to-maturity securities, amortized cost		77
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of our marketable securities		44
Mandatorily Redeemable Preferred Equity Ownership Interest | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	65
Number of hotels	3	3
Held-to-maturity securities, fair value		$ 87
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial paper, maturity term (generally 30 days or less)		30 days