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

Franchising, Marketing and Reservation Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net revenues	$ 492	$ 560	$ 533	$ 468	$ 527	$ 604	$ 435	$ 302	$ 2,053	$ 1,868	$ 1,280
Minimum
Disaggregation of Revenue [Line Items]
Franchise/management agreement term									10 years
Maximum
Disaggregation of Revenue [Line Items]
Franchise/management agreement term									20 years
Initial franchise fee revenue
Disaggregation of Revenue [Line Items]
Net revenues									$ 18	20	14
Forgiveness of note receivable
Disaggregation of Revenue [Line Items]
Net revenues									$ 8	$ 7	$ 6