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Debt - Two Thousand Fifteen Credit Facility - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jul. 01, 2021
Dec. 31, 2020
Debt Instrument [Line Items]            
Total interest expense and commitments fees $ 11,000,000 $ 7,000,000 $ 22,000,000 $ 9,000,000    
2015 Credit Facility            
Debt Instrument [Line Items]            
Total interest expense and commitments fees 1,000,000 5,000,000 1,000,000 6,000,000    
2015 Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Borrowing capacity under Credit Facility 500,000,000   $ 500,000,000      
Credit facility, maturity date     May 12, 2024      
Line Of Credit Facility Unused Capacity Commitment Fee Percentage     0.50%      
Outstanding borrowings 0   $ 0     $ 0
Amount borrowed       700,000,000    
2015 Credit Facility | Revolving Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.25%      
Floor Interest Rate     1.00%      
2015 Credit Facility | Letter of Credit            
Debt Instrument [Line Items]            
Borrowing capacity under Credit Facility 15,000,000   $ 15,000,000      
Letters of credit outstanding amount 4,000,000   4,000,000      
2015 Credit Facility | Borrowings On Same Day Notice            
Debt Instrument [Line Items]            
Borrowing capacity under Credit Facility 40,000,000   $ 40,000,000      
2015 Credit Facility | Amended 2015 Credit Facility in May 2020 and December 2020 | Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility, maturity date     May 12, 2022      
Minimum liquidity required 150,000,000   $ 150,000,000      
Credit facility, extended maturity date     May 12, 2024      
Credit Facility, description     We amended the 2015 Credit Facility in May 2020 and December 2020 to, among other things:   • suspend the leverage ratio covenant for quarterly testing of compliance beginning in the second quarter of 2020, replacing it with a minimum liquidity covenant through June 30, 2021 (requiring the Company to maintain $150 million of unrestricted cash, cash equivalents and short-term investments less deferred merchant payables plus available revolver capacity), until the earlier of (a) the first day after June 30, 2021 through maturity on which borrowings and other revolving credit utilizations under the revolving commitments exceed $200 million, and (b) the election of the Company, at which time the leverage ratio covenant will be reinstated (the “Leverage Covenant Holiday”);   • decrease the aggregate amount of revolving loan commitments available to $500 million from $1.2 billion;   • extend the maturity date of the 2015 Credit Facility from May 12, 2022 to May 12, 2024; and   • secure the obligations under the agreement.      
2015 Credit Facility | Amended 2015 Credit Facility in May 2020 and December 2020 | Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Borrowing capacity under Credit Facility $ 500,000,000   $ 500,000,000      
2015 Credit Facility | Amended 2015 Credit Facility in May 2020 and December 2020 | Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Borrowing capacity under Credit Facility   $ 1,200,000,000   $ 1,200,000,000    
2015 Credit Facility | Amended 2015 Credit Facility in May 2020 and December 2020 | Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Maximum borrowings allowed excluding leverage ratio covenant         $ 200,000,000