Quarterly report pursuant to Section 13 or 15(d)

Inventory (Narrative) (Details)

v3.21.2
Inventory (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2013
Inventory [Line Items]            
Inventory transferred to Property and Equipment       $ 56 $ 28  
COVID-19 [Member]            
Inventory [Line Items]            
Exchange inventory write-off $ 0 $ 10   0 48  
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]            
Exchange inventory write-off   $ 10 $ 38   $ 48