Business Segments - Schedule of Segment Operating Performance Reconciled to Consolidated Amounts (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		$ 466	$ 427	$ 1,370	$ 1,357
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	(9)	(8)	(29)	(24)
Intersegment eliminations | Maximum
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental expense for model units		1	1	1	1
Intersegment eliminations | Promotional Allowances
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		$ (9)	$ (8)	$ (29)	$ (24)

[1]   ⁽¹⁾ 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 $9 million and $8 million for the three months ended September 30, 2019 and 2018, respectively, and $29 million and $24 million for the nine months ended September 30, 2019 and 2018, respectively.