Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2018 USD ($)
Loss Contingencies [Line Items]
Rent expense	$ 8,000,000	$ 5,000,000	$ 4,000,000
Purchase commitments	130,000,000
La Quinta deferred tax liability, current	205,000,000	0
Litigation reserves	25,000,000	3,000,000
Litigation receivable covered by insurance	21,000,000
Deferred fees receivable	21,000,000	19,000,000
Contract liabilities	$ 273,000,000	248,000,000
Post-closing credit support, liability				$ 41,000,000
Post-closing credit support, share of incurred losses				0.33
European vacation rental business, life of royalty fee	20 years
European vacation rental business, royalty fee percentage	1.00%
Royalty fees	$ 5,000,000
Separation and distribution agreement, assumed share of contingent liability	0.33
Receivables due from former parent	$ 44,000,000
Affiliated Entity
Loss Contingencies [Line Items]
Post-closing credit support (up to)				$ 46,000,000
Post-closing credit support, share of incurred losses				0.67
Receivable for share of escrow deposit released				$ 46,000,000
Post-closing credit support, receivable	$ 15,000,000
Separation and distribution agreement, assumed share of contingent liability	0.67
Other non-current liabilities
Loss Contingencies [Line Items]
Post-closing credit support (up to)				$ 62,000,000
Remaining amount of contingent liability assumed	$ 24,000,000
Receivable
Loss Contingencies [Line Items]
Post-closing credit support, receivable	24,000,000
Other current assets
Loss Contingencies [Line Items]
Post-closing credit support, receivable	39,000,000
Current liabilities
Loss Contingencies [Line Items]
Remaining amount of contingent liability assumed	11,000,000
Maximum
Loss Contingencies [Line Items]
Range of possible loss, portion not accrued (up to)	35,000,000
Wyndham Hotels & Resorts, Inc.
Loss Contingencies [Line Items]
Annual cap	26,000,000
Guarantor obligations, current carrying value	24,000,000	23,000,000
Guarantor offsetting asset carrying value	11,000,000	12,000,000
Amortization expense, contingent asset	1,000,000	2,000,000	$ 4,000,000
Guarantees subject to recapture provisions	46,000,000
Wyndham Hotels & Resorts, Inc. | Other non-current liabilities
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	15,000,000	16,000,000
Wyndham Hotels & Resorts, Inc. | Accrued expenses
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	9,000,000	7,000,000
Wyndham Hotels & Resorts, Inc. | Other non-current assets
Loss Contingencies [Line Items]
Guarantor offsetting asset carrying value	10,000,000	11,000,000
Guarantees subject to recapture provisions	45,000,000	41,000,000
Wyndham Hotels & Resorts, Inc. | Other current assets
Loss Contingencies [Line Items]
Guarantor offsetting asset carrying value	1,000,000	1,000,000
Guarantees subject to recapture provisions	$ 1,000,000
Wyndham Hotels & Resorts, Inc. | Minimum
Loss Contingencies [Line Items]
Guarantor obligations, term	9
Guarantees, remaining life	4 years
Wyndham Hotels & Resorts, Inc. | Maximum
Loss Contingencies [Line Items]
Guarantor obligations, term	10
Annual cap	$ 103,000,000
Guarantees, remaining life	5 years
Wyndham Hotels & Resorts, Inc. | Weighted Average
Loss Contingencies [Line Items]
Guarantor obligations, term	4
Technology Equipment
Loss Contingencies [Line Items]
Purchase commitments	$ 89,000,000
Management Fee
Loss Contingencies [Line Items]
Contract liabilities	21,000,000	$ 19,000,000
Hotel Management Guarantee Expense [Member] | Wyndham Hotels & Resorts, Inc.
Loss Contingencies [Line Items]
Hotel Management Guarantee Expenses	$ 4,000,000