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	6 Months Ended
		Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Time Share
Inventory [Line Items]
Expenses	[1]		$ 4	$ 5
Fee For Service Upgrades
Inventory [Line Items]
Expenses		$ 2	$ 3	$ 5

[1] Costs of sales true-up reduced costs of VOI sales and increased inventory in the periods presented.