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Debt - Public Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 03, 2021
Jan. 15, 2021
May 21, 2020
Apr. 24, 2020
Apr. 06, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]                    
Payment for early redemption of debt               $ 22 $ 59  
Early termination premium                 35  
Interest expense                 17  
6.150% Notes, due 2020                    
Debt Instrument [Line Items]                    
Early redemption of debt         $ 1,000          
Long-term debt, interest rate         6.15%          
Payment for early redemption of debt         $ 1,020          
5.400% Notes, due 2021                    
Debt Instrument [Line Items]                    
Early redemption of debt $ 476 $ 361 $ 589   300          
Long-term debt, interest rate                   5.40%
Payment for early redemption of debt         $ 315          
Interest expense             $ 24      
Accrued interest paid   $ 5                
6.875% Notes, due 2025                    
Debt Instrument [Line Items]                    
Early redemption of debt       $ 1,200            
Long-term debt, interest rate       6.875%   6.875%   6.875%    
Deferred financing costs             14   $ 14  
5.870% Notes, due 2022                    
Debt Instrument [Line Items]                    
Early redemption of debt     $ 151              
Long-term debt, interest rate                   5.87%
Payment for early redemption of debt 503                  
Early termination premium           $ 23        
Interest expense             $ 4      
Accrued interest paid 5                  
5.400% and 5.870% Notes, Redemption                    
Debt Instrument [Line Items]                    
Increase (decrease) interest expense, net $ (47)