Commitments and Contingencies - Commitments (Detail) € in Millions, BRL in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2015 BRL Entity	Sep. 30, 2015 USD ($) Entity	Sep. 30, 2015 EUR (€) Entity
Real Estate Investment | Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Investment commitments expected to be funded in 2015		$ 11
Development of Dual Branded Property
Commitments and Contingencies Disclosure [Line Items]
Investment commitments	BRL 10	$ 2
Investment in Other Joint Venture Commitment
Commitments and Contingencies Disclosure [Line Items]
Acquisition interests in joint ventures | Entity	2	2	2
Contingent acquisition period	6 years
Deposits in conjunction with contingent obligation to acquire the interest in joint ventures		$ 20	€ 15
Deposits in conjunction with contingent obligation to acquire the interest in joint ventures, remaining amount		12	€ 11
Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments		161
Purchase commitments expected to be funded in 2015		19
Purchase commitments expected to be funded in 2016		56
Purchase commitments expected to be funded in 2017		45
Purchase commitments expected to be funded thereafter		41
Commitments
Commitments and Contingencies Disclosure [Line Items]
Investment commitments not expected to be funded		30
Lodging Property
Commitments and Contingencies Disclosure [Line Items]
Loan commitment, amount		5
Full Service and Limited Service | Equity Investment for Non Controlling Interest in Partnership Commitment | Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Investment commitments		7
Limited Service | Equity Investment for Non Controlling Interest in Partnership Commitment
Commitments and Contingencies Disclosure [Line Items]
Investment commitments expected to be funded in 2016		3
Investment commitments not expected to be funded		19
Limited Service | Equity Investment for Non Controlling Interest in Partnership Commitment | Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Investment commitments		$ 22