Wyndham Hotels & Resorts, Inc. Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Summary of Net Revenues and Adjusted EBITDA by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Revenues	$ 604	$ 347	$ 1,341	$ 967	$ 1,280
Adjusted EBITDA	166	124	382	307
Reportable Segments
Segment Reporting Information [Line Items]
Net Revenues	600	347	1,337	967
Adjusted EBITDA	183	133	423	336
Reportable Segments \| Hotel Franchising
Segment Reporting Information [Line Items]
Net Revenues	348	258	840	682
Adjusted EBITDA	178	132	394	321
Reportable Segments \| Hotel Management
Segment Reporting Information [Line Items]
Net Revenues	252	89	497	285
Adjusted EBITDA	5	1	29	15
Corporate and Other
Segment Reporting Information [Line Items]
Net Revenues	4	0	4	0
Adjusted EBITDA	$ (17)	$ (9)	$ (41)	$ (29)