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

Separation-Related and Transaction-Related Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation-related costs	$ 12	$ 0
Transaction-related costs	2
La Quinta Hotel Franchising and Management Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction-related costs	7
Rio Mar
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reversal of accrued acquisition-related contingency	5
Spin-Off, Hotel Group Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation-related costs	$ 12