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Debt And Related Expenses (Narrative) (Details) - USD ($)
3 Months Ended
Apr. 10, 2021
Mar. 31, 2021
Jun. 10, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Redemption of senior notes   $ 533,000,000    
Early retirement of debt   20,000,000    
Charge on early retirement of debt, cash retirement costs   27,000,000    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Early retirement of debt   20,000,000    
Charge on early retirement of debt, cash retirement costs   27,000,000    
Charge on early retirement of debt, noncash charges   47,000,000    
6.00% Due 2022 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Redemption of senior notes   $ 43,000,000    
Debt interest rate, stated percentage   6.00%    
5.875% Due 2028 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Redemption of senior notes   $ 175,000,000    
Debt interest rate, stated percentage   5.875%    
4.5% Due 2030 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Redemption of senior notes   $ 315,000,000    
Debt interest rate, stated percentage   4.50%    
5.25% Due 2027 [Member] | Senior Notes [Member] | Subsequent Event        
Debt Instrument [Line Items]        
Redemption of senior notes $ 210,000,000      
Debt interest rate, stated percentage 5.25%      
5.75% due June 1, 2026 [Member]        
Debt Instrument [Line Items]        
Debt interest rate, stated percentage   5.75%   5.75%
5.75% due June 1, 2026 [Member] | Senior Notes [Member] | Subsequent Event        
Debt Instrument [Line Items]        
Debt interest rate, stated percentage     5.75%  
Senior Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit Facility, borrowing capacity   $ 3,000,000,000.0    
Outstanding credit facility borrowings   $ 0    
Debt-to-capitalization ratio   0.274    
Outstanding letters of credit   $ 2,000,000    
Senior Credit Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt-to-capitalization ratio   0.65