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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 01, 2018
Property
$ / shares
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
vacation_ownership_unit
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]        
Number of hotels acquired | Property 4      
Business combinations, pro forma, acquisition-related costs     $ 12  
Vacation Ownership        
Business Acquisition [Line Items]        
Goodwill   $ 2,448   $ 2,448
Exchange & Third-Party Management        
Business Acquisition [Line Items]        
Goodwill   $ 380   $ 380
Marco Island Florida        
Business Acquisition [Line Items]        
Number of vacation ownership units acquired | vacation_ownership_unit     20  
Payments to acquire real estate     $ 24  
ILG, Inc        
Business Acquisition [Line Items]        
Business combination, share conversion ratio 0.165      
Business combination, share price (in usd per share) | $ / shares $ 119.00      
ILG, Inc | Minimum        
Business Acquisition [Line Items]        
Vacation ownership product, financing term   5 years    
ILG, Inc | Maximum        
Business Acquisition [Line Items]        
Vacation ownership product, financing term   15 years    
ILG, Inc | ILG, Inc        
Business Acquisition [Line Items]        
Business combination, share price (in usd per share) | $ / shares $ 14.75