Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Borrowing Arrangements (Narrative) (Details)

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Long-Term Debt and Borrowing Arrangements (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
May 30, 2018
May 31, 2018
Apr. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]                
Bridge loan     $ 1,500,000,000          
Capital lease obligation       $ 67,000,000   $ 67,000,000   $ 0
Interest expense       10,000,000 $ 2,000,000 11,000,000 $ 4,000,000  
Affiliated Entity                
Debt Instrument [Line Items]                
Contribution of outstanding borrowings due to former Parent           197,000,000    
Interest Rate Swap                
Debt Instrument [Line Items]                
Total notional amount $ 1,000,000,000.0              
Interest Rate Swap 1                
Debt Instrument [Line Items]                
Total notional amount $ 500,000,000              
Term of derivative contract 5 years              
Fixed interest rate on interest rate swap 2.66%              
Interest Rate Swap 2                
Debt Instrument [Line Items]                
Total notional amount $ 500,000,000              
Term of derivative contract 2 years 6 months              
Fixed interest rate on interest rate swap 2.52%              
Wyndham Worldwide                
Debt Instrument [Line Items]                
Capital lease obligation       66,000,000   66,000,000    
Capital lease asset       43,000,000   43,000,000    
Wyndham Worldwide | Affiliated Entity                
Debt Instrument [Line Items]                
Contribution of outstanding borrowings due to former Parent   $ 197,000,000            
Debt due to former Parent               $ 184,000,000
Interest expense       $ 10,000,000 $ 2,000,000 $ 11,000,000 $ 4,000,000  
Capital lease | Wyndham Worldwide                
Debt Instrument [Line Items]                
Debt instrument, interest rate, stated percentage       4.50%   4.50%    
Term loan (due May 2025)                
Debt Instrument [Line Items]                
Amortization of loan, equal installments   1.00%            
Mandatory prepayments, percentage net cash proceeds from issuances or incurrence of debt   100.00%            
Mandatory prepayments, percentage of net cash proceeds from certain sales or other dispositions of assets   100.00%            
Mandatory prepayments, percentage of net cash proceeds from certain sales or other disposition of assets, step down one   50.00%            
Mandatory prepayments, percentage of net cash proceeds from certain sales or other disposition of assets, step down two   0.00%            
Mandatory prepayment in excess of cash flow   50.00%            
Mandatory prepayment in excess of cash flow, step down one   25.00%            
Mandatory prepayment in excess of cash flow, step down two   0.00%            
Term loan (due May 2025) | Long-term Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 1,600,000,000.0              
Aggregate fair value of interest rate swaps       $ 3,000,000   $ 3,000,000    
Senior Secured Credit Facility                
Debt Instrument [Line Items]                
Aggregate amount of revolving loans (not to exceed)   $ 550,000,000            
5.375% senior unsecured notes (due April 2026) | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate, stated percentage       5.375%   5.375%    
Net proceeds from issuance of debt     493,000,000          
5.375% senior unsecured notes (due April 2026) | Long-term Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount     $ 500,000,000          
Debt instrument, interest rate, stated percentage     5.375%          
5.375% senior unsecured notes (due April 2026) | Long-term Debt | Wyndham Worldwide                
Debt Instrument [Line Items]                
Payments to obtain financing commitments     $ 12,000,000          
LIBOR | Term loan (due May 2025)                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   1.75%            
Basis spread on variable rate, floor (as a percent)   0.00%            
Base Rate | Term loan (due May 2025)                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   0.75%            
$750 million revolving credit facility (due May 2023)                
Debt Instrument [Line Items]                
Total Capacity   $ 750,000,000   $ 750,000,000   $ 750,000,000    
Commitment fee percentage   0.20%            
Debt issuance costs       $ 6,000,000   $ 6,000,000    
$750 million revolving credit facility (due May 2023) | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   0.50%            
$750 million revolving credit facility (due May 2023) | Minimum | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   1.50%            
$750 million revolving credit facility (due May 2023) | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   1.00%            
$750 million revolving credit facility (due May 2023) | Maximum | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)   2.00%