Business Segments - Schedule of Segment Operating Performance Reconciled to Consolidated Amounts (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2020	[1]	Sep. 30, 2020	[1]	Jun. 30, 2020	[1]	Mar. 31, 2020	[1]	Dec. 31, 2019	[1]	Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		$ 212		$ 208		$ 123		$ 351		$ 468		$ 466		$ 454		$ 450		$ 894	[1]	$ 1,838	[1]	$ 1,999
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[2],[3]																	(13)		(36)		(32)
Intersegment eliminations | Maximum
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental expense for model units																		1		1		1
Intersegment eliminations | Billing and Collection Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues																		$ (13)		$ (35)		$ (31)

[1] The sum of the earnings per share for the four quarters may differ from annual earnings per share due to the required method of computing the weighted average shares in interim periods.

[2] Includes charges to the real estate sales and financing segment from the resort operations and club management segment for the rental of model units to show prospective buyers. These charges totaled less than $1 million for the year ended December 31, 2020 and $1 million for the years ended December 31, 2019 and 2018.

[3] Includes charges to the real estate sales and financing segment from the resort operations and club management segment for fulfillment of discounted marketing package stays at resorts. These charges totaled $13 million, $35 million and $31 million for the years ended December 31, 2020, 2019 and 2018, respectively.