Quarterly report pursuant to Section 13 or 15(d)

Inventory (Narrative) (Details)

v3.21.2
Inventory (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2014
Inventory [Line Items]            
Inventory transferred to Property and Equipment     $ 11 $ 13    
COVID-19 [Member]            
Inventory [Line Items]            
Inventory Write-down $ 0 $ 0 0 38    
Las Vegas, Nevada Inventory Sales [Member] | Maximum [Member]            
Inventory [Line Items]            
Long-term Purchase Commitment, Amount     $ 65      
Vacation Ownership Inventory Sales            
Inventory [Line Items]            
Gain (Loss) on Sale of Properties           $ 0
Operating Expense [Member] | COVID-19 [Member]            
Inventory [Line Items]            
Inventory Write-down       $ 38 $ 48