Inventory - Schedule of Costs of Sales True-ups Relating to VOI Products and Impacts on the Carrying Value of Inventory (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Time Share
Inventory [Line Items]
Expenses	[1]			$ 1	$ 4
Fee For Service Upgrades
Inventory [Line Items]
Expenses		$ 1	$ 2	$ 4	$ 7

[1] For the nine months ended September 30, 2021, the costs of sales true-up increased costs of VOI sales and decreased inventory. For the nine months ended September 30, 2020, the costs of sales true-up decreased costs of VOI sales and increased inventory.