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
		Mar. 31, 2021	Mar. 31, 2020
Time Share
Inventory [Line Items]
Expenses	[1]	$ 6	$ 4
Fee For Service Upgrades
Inventory [Line Items]
Expenses		$ 1	$ 5

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