Segment Information (Summary Of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net Revenues
Net revenues	$ 1,007	$ 978	$ 1,914	$ 1,860
Reconciliation of Net income to Adjusted EBITDA
Net income attributable to Wyndham Destinations shareholders	378	85	412	175
(Income)/loss from operations of discontinued businesses, net of income taxes	42	(71)	49	(75)
(Income) on disposal of discontinued businesses, net of income taxes	(432)	0	(432)	0
Provision/(benefit) for income taxes	38	(4)	62	(2)
Depreciation and amortization	36	33	73	65
Interest expense	46	39	91	73
Interest (income)	(2)	(1)	(3)	(3)
Separation and related costs	133	0	163	0
Restructuring	0	0	0	6
Asset impairments	0	135	0	140
Stock-based compensation	4	11	17	25
Adjusted EBITDA	243	227	432	404
Adjusted EBITDA
Adjusted EBITDA	243	227	432	404
Segment Assets
Segment Assets	7,075		7,075		$ 6,886
Separation and Related Costs [Member]
Reconciliation of Net income to Adjusted EBITDA
Stock-based compensation	87		92
Operating Segments [Member]
Net Revenues
Net revenues	1,008	979	1,915	1,861
Reconciliation of Net income to Adjusted EBITDA
Adjusted EBITDA	264	250	476	453
Adjusted EBITDA
Adjusted EBITDA	264	250	476	453
Segment Assets
Segment Assets	6,930		6,930		6,718
Corporate and Other [Member]
Net Revenues
Net revenues	(1)	(1)	(1)	(1)
Reconciliation of Net income to Adjusted EBITDA
Adjusted EBITDA	(21)	(23)	(44)	(49)
Adjusted EBITDA
Adjusted EBITDA	(21)	(23)	(44)	(49)
Segment Assets
Segment Assets	145		145		168
Vacation Ownership [Member] | Operating Segments [Member]
Net Revenues
Net revenues	770	745	1,431	1,384
Reconciliation of Net income to Adjusted EBITDA
Adjusted EBITDA	194	185	327	311
Adjusted EBITDA
Adjusted EBITDA	194	185	327	311
Segment Assets
Segment Assets	5,298		5,298		5,246
Exchange & Rentals [Member] | Operating Segments [Member]
Net Revenues
Net revenues	238	234	484	477
Reconciliation of Net income to Adjusted EBITDA
Adjusted EBITDA	70	65	149	142
Adjusted EBITDA
Adjusted EBITDA	70	$ 65	149	$ 142
Segment Assets
Segment Assets	$ 1,632		$ 1,632		$ 1,472