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

Franchising, Marketing and Reservation Activities (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net revenues	$ 527	$ 604	$ 435	$ 302	$ 312	$ 347	$ 331	$ 289	$ 1,868	$ 1,280	$ 1,269
Bad Debt Expense On Development Advances (Less Than $1 million during 2017)									1	0	1
Proceeds from development advance notes (less than $1 million for three months ended September 30, 2017)									14	7	3
Development advances									27	8	9
Franchisees and hotel owners
Disaggregation of Revenue [Line Items]
Development advance notes	$ 78				$ 64				$ 78	64
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									$ 20	14	19
Forgiveness of note receivable
Disaggregation of Revenue [Line Items]
Net revenues									$ 7	$ 6	$ 7