Commitments and Contingencies - Commitments (Detail)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2015
Real Estate Investment
Upper Limit
USD ($)
Mar. 31, 2015
Development of Dual Branded Property
USD ($)
Mar. 31, 2015
Development of Dual Branded Property
BRL
Mar. 31, 2015
Investment in Other Joint Venture Commitment
USD ($)
Entity
Mar. 31, 2015
Investment in Other Joint Venture Commitment
EUR (€)
Mar. 31, 2015
Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services
USD ($)
Mar. 31, 2015
Commitments
USD ($)
Mar. 31, 2015
Lodging Property
USD ($)
Mar. 31, 2015
Full Service and Limited Service
Equity Investment for Non Controlling Interest in Partnership Commitment
USD ($)
Mar. 31, 2015
Full Service and Limited Service
Equity Investment for Non Controlling Interest in Partnership Commitment
Upper Limit
USD ($)
Mar. 31, 2015
Limited Service
Equity Investment for Non Controlling Interest in Partnership Commitment
USD ($)
Mar. 31, 2015
Limited Service
Equity Investment for Non Controlling Interest in Partnership Commitment
Upper Limit
USD ($)
Mar. 31, 2015
Debt Securities
Mandatorily Redeemable Preferred Equity Ownership Interest
USD ($)
hotel
Commitments and Contingencies Disclosure [Line Items]                          
Investment commitments   $ 16 52             $ 8   $ 22 $ 10
Investment commitments expected to be funded in 2015 11               2   3    
Investment commitments not expected to be funded             29   6   13    
Investment commitments expected to be funded in 2016                     6    
Acquisition interests in joint ventures       2 2                
Contingent acquisition period       6 years 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                
Purchase commitments           197              
Purchase commitments expected to be funded in 2015           67              
Purchase commitments expected to be funded in 2016           45              
Purchase commitments expected to be funded in 2017           44              
Purchase commitments expected to be funded thereafter           41              
Number of hotels included in investment commitments                         3
Loan commitment, amount               $ 2