Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Borrowing Arrangements (Schedule of Company's Indebtedness) (Details)

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Long-Term Debt and Borrowing Arrangements (Schedule of Company's Indebtedness) (Details) - USD ($)
Dec. 31, 2020
Aug. 31, 2020
Dec. 31, 2019
Apr. 30, 2018
Debt Instrument [Line Items]        
Finance leases $ 55,000,000   $ 60,000,000  
Total long-term debt 2,597,000,000   2,122,000,000  
Less: Current portion of long-term debt 21,000,000   21,000,000  
Long-term debt 2,576,000,000   2,101,000,000  
5.375% senior unsecured notes (due April 2026)        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage       5.375%
Senior Unsecured Notes due August 2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   4.375%    
$750 million revolving credit facility (due May 2023)        
Debt Instrument [Line Items]        
Maximum borrowing capacity 750,000,000      
Debt issuance costs     4,000,000  
Line of Credit | $750 million revolving credit facility (due May 2023)        
Debt Instrument [Line Items]        
Long-term debt $ 0   $ 0  
Long-term Debt | Term loan (due May 2025)        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 3.18%   4.00%  
Long-term debt $ 1,554,000,000   $ 1,568,000,000  
Senior Notes | 5.375% senior unsecured notes (due April 2026)        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 5.375%   5.38%  
Long-term debt $ 496,000,000   $ 494,000,000  
Senior Notes | Senior Unsecured Notes due August 2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 4.375%      
Long-term debt $ 492,000,000   0  
Debt, Weighted Average Interest Rate 4.38%      
Term loan and senior unsecured notes        
Debt Instrument [Line Items]        
Debt issuance costs $ 22,000,000   $ 18,000,000  
Wyndham Worldwide | Capital lease        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 4.50%   4.50%