Inventory - Schedule of Costs of Sales True-ups Relating to VOI Products and Impacts on the Carrying Value of Inventory (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Sales true-up
Inventory [Line Items]
Expenses	[1]	$ 4	$ 14

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