Revenue from Contracts with Customers - Schedule of Deferred Revenue, Cost of VOI Sales and Direct Selling Costs from Sales of VOIs Related to Project Under Construction (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Sales of VOIs, net		$ 262	$ 186
Sales of VOIs
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Sales of VOIs, net		169	84
Cost of VOI sales	[1]	50	27
Sales and marketing expense		$ 25	$ 12

[1] Includes anticipated Cost of VOI sales related to inventory associated with Sales of VOIs under construction that will be acquired under a just-in-time arrangement once construction is complete.