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Inventory (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]        
Property and Equipment transferred to Inventory   $ 41    
Inventory transferred to Property and Equipment     $ 23  
Asset impairments   27 $ (4) $ 205
Maximum potential future payments   1,260    
Inventory write-down       28
Inventory Sale        
Inventory [Line Items]        
Asset impairments   27    
Las Vegas, Nevada and St. Thomas, U.S. Virgin Island Inventory Sales        
Inventory [Line Items]        
Maximum potential future payments   $ 124    
VOI Development        
Inventory [Line Items]        
Asset impairments $ 135     135
Inventory write-down       $ 28