Annual report pursuant to Section 13 and 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 12 Months Ended
May 31, 2018
May 31, 2018
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 30, 2018
Debt Instrument [Line Items]              
Hedging ineffectiveness recognized       $ 0 $ 0    
Reclassification during next twelve months       10,000,000      
Interest expense       104,000,000 67,000,000 $ 7,000,000  
Interest paid       100,000,000 56,000,000    
Interest Income, Other       4,000,000 7,000,000 $ 1,000,000  
Interest Rate Swap              
Debt Instrument [Line Items]              
Derivative, Notional Amount             $ 1,100,000,000
Effect of interest rate swaps in interest expense       $ 3,000,000 2,000,000    
Interest Rate Swap 1              
Debt Instrument [Line Items]              
Derivative, Notional Amount             600,000,000
Interest Rate Swap 2              
Debt Instrument [Line Items]              
Derivative, Notional Amount             500,000,000
Wyndham Worldwide              
Debt Instrument [Line Items]              
Capital lease obligation         66,000,000    
Capital lease asset         $ 43,000,000    
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     $ 1,600,000,000
Debt instrument, interest rate, stated percentage       4.00% 4.25%    
Aggregate fair value of interest rate swaps       $ 34,000,000 $ 5,000,000    
Senior Secured Credit Facility              
Debt Instrument [Line Items]              
Aggregate amount of revolving loans (not to exceed) $ 550,000,000 $ 550,000,000          
Percentage of EBITDA (not to exceed) 100.00%            
Senior unsecured notes (due April 2026) | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage       5.375% 5.38%    
Net proceeds from issuance of debt     $ 493,000,000        
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%        
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%          
Weighted Average | Interest Rate Swap 1              
Debt Instrument [Line Items]              
Fixed interest rate on interest rate swap             2.54%
Weighted Average | Interest Rate Swap 2              
Debt Instrument [Line Items]              
Fixed interest rate on interest rate swap             2.40%
$750 million revolving credit facility (due May 2023)              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 750,000,000 $ 750,000,000   $ 750,000,000      
Commitment fee percentage   0.20%          
Debt issuance costs       $ 4,000,000 $ 5,000,000    
$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%