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Asset Dispositions and Impairments (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2010
Mar. 31, 2011
Minority Investment - Japan Hotel [Member]
Mar. 31, 2010
Minority Interest and None-core Asset [Member]
Asset Dispositions and Impairments (Textuals) [Abstract]          
Net cash proceeds from disposal of wholly-owned hotel $ 237 $ 78 $ 78    
Gains from insurance proceeds related to damages by tornado   20      
Approximate cash proceeds from sale of companys interest in a consolidated joint venture 44        
Company's mortgage debt assumed by buyer in sale of interest in a consolidated joint venture 57        
Loss recognized in discontinued operations from sale of its interest in a consolidated joint venture, net of tax 18        
Approximate proceeds from sale of non-core assets 2        
Dispositions (Textuals) (Abstract)          
Gain (loss) on disposition of assets 66        
Impairment loss relating to minority investment in a joint venture hotel located in Japan       32  
Approximate amount of gain from sale of non-core assets $ 2       $ 1