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Business Segments Equity in Losses of Equity Method Investees (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 15, 2012
Jun. 15, 2012
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees $ (2) $ (8) $ (9) $ (2)
Total segment
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees 0 (6) (7) 0
Other unallocated corporate
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees (2) (2) (2) (2)
North American Full-Service Segment | Total segment
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees 2 1 1 2
North American Limited-Service Segment | Total segment
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees 1 1 1 2
International Segment | Total segment
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees (1) 2 2 (1)
Luxury Segment | Total segment
       
Segment Reporting Information [Line Items]        
Equity in losses of equity method investees $ (2) $ (10) $ (11) $ (3)