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Guarantees and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2011
Hotel
Dec. 31, 2010
Hotel
Dec. 31, 2009
Hotel
Dec. 31, 2011
Starwood
Jan. 31, 2005
Contingent Consideration
Hotel
Dec. 31, 2011
Indemnification Agreement
Dec. 31, 2011
Environmental Remediation Expense
Starwood
Property
Dec. 31, 2011
Municipal Bonds
Commitments and Contingencies Disclosure [Line Items]                
Aggregate contingent liabilities relating to our former restaurant business $ 14              
Guarantee obligation amount               14.7
Debt maturity date               2027
Hotel sold that are still contingently liable for ground lease 1 2 6   2      
Future minimum lease payments 1,660         13    
Number of properties             2  
Environmental liabilities       $ 3