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Long-Term Debt - Revolving Credit Facility (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Jan. 01, 2020
A&R Credit Agreement | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Letters of credit     $ 7,000,000  
Maximum borrowing capacity   $ 800,000,000 1,000,000,000 $ 1,000,000,000
Funds available for other borrowings     993,000,000  
Outstanding borrowings     $ 0  
Non-cash accelerated amortization $ 4,000,000      
One-time charges 3,000,000      
Payments of debt restructuring costs $ 6,000,000      
Term Loan A | Loans Payable        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   608,000,000   $ 1,000,000,000
Previously outstanding term loan | Loans Payable        
Line of Credit Facility [Line Items]        
Extinguishment of debt   $ 445,000,000