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Planned Reverse Morris Trust Transaction - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 28, 2015
USD ($)
Property
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Subsequent Event | Vistana Signature Experiences Inc        
Restructuring Cost and Reserve [Line Items]        
Number of owned properties transfer to new entity | Property 5      
Subsidiary cumulative percentage ownership after all transactions 55.00%      
Transaction values of of merger $ 1,500      
Cash distribution in connection with merger $ 132      
Subsequent Event | Vistana Signature Experiences Inc | Interval Leisure Group Inc        
Restructuring Cost and Reserve [Line Items]        
Subsidiary cumulative percentage ownership after all transactions 45.00%      
Spinoff [Member]        
Restructuring Cost and Reserve [Line Items]        
Other special charges   $ 10 $ 16 $ 26