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Debt (Revolving Credit Facility under the Senior Credit Agreement) (Narrative) (Details) - USD ($)
2 Months Ended 12 Months Ended
Feb. 25, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 11, 2018
Mar. 31, 2018
Line of Credit Facility [Line Items]            
Repayments of revolving credit facility   $ 1,005,000,000 $ 590,000,000 $ 835,000,000    
Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Borrowings on the revolving credit facility   895,000,000.0        
Repayments of revolving credit facility   1,000,000,000.0        
Line of credit facility, outstanding   380,000,000.0        
Line of credit facility, maximum borrowing capacity   $ 1,250,000,000     $ 1,250,000,000 $ 1,000,000,000.0
Revolving credit facility, maturity date   Apr. 11, 2023        
Revolving credit facility, effective interest rate   1.61%        
Revolving Credit Facility [Member] | Subsequent Event [Member]            
Line of Credit Facility [Line Items]            
Borrowings on the revolving credit facility $ 680,000,000.0          
Repayments of revolving credit facility 430,000,000.0          
Line of credit facility, outstanding $ 630,000,000.0          
Minimum [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   1.125%        
Line of credit facility, commitment fee   0.20%        
Minimum [Member] | Revolving Credit Facility [Member] | Eurodollar [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   1.125%        
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   0.125%        
Maximum [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   1.75%        
Line of credit facility, commitment fee   0.25%        
Maximum [Member] | Revolving Credit Facility [Member] | Eurodollar [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   1.75%        
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate   0.75%