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

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Operating Loss Carryforwards [Line Items]
Effective tax rate	28.40%	42.00%		28.50%	41.50%
Federal and state
Operating Loss Carryforwards [Line Items]
Cash income tax payments, net of refunds		$ 11	$ 27
Foreign
Operating Loss Carryforwards [Line Items]
Cash income tax payments, net of refunds		$ 2		$ 9	$ 9
Wyndham Worldwide \| Federal and state
Operating Loss Carryforwards [Line Items]
Cash income tax payments, net of refunds				$ 27	$ 75