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Debt - Public Debt (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 02, 2021
Sep. 01, 2021
May 03, 2021
Jan. 15, 2021
May 21, 2020
Apr. 06, 2020
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 24, 2020
Debt Instrument [Line Items]                              
Early redemption of debt $ 600,000,000                            
Early termination premium                   $ 35,000,000          
Debt prepayment cost                       $ 138,000,000 $ 59,000,000 $ 0  
Interest expense                     $ 17,000,000        
5.125% Notes, due 2024                              
Debt Instrument [Line Items]                              
Early redemption of debt             $ 100,000,000 $ 100,000,000              
Long- term debt, interest rate             5.125% 5.125%       5.125%      
Repurchase of debt             $ 111,000,000 $ 111,000,000              
Early termination premium             10,000,000 10,000,000              
Interest expense             $ 1,000,000 $ 1,000,000              
6.875% Notes, due 2025                              
Debt Instrument [Line Items]                              
Long- term debt, interest rate 6.875%           6.875%         6.875%     6.875%
Early termination premium $ 105,000,000                            
Interest expense $ 14,000,000                            
Aggregate principal amount                             $ 1,200,000,000
Deferred financing costs                   14,000,000          
3.000% Notes due 2029                              
Debt Instrument [Line Items]                              
Early redemption of debt   $ 700,000,000                          
Long- term debt, interest rate   3.00%                          
5.870% Notes, due 2022(2)                              
Debt Instrument [Line Items]                              
Early redemption of debt     $ 476,000,000   $ 151,000,000                    
Long- term debt, interest rate         5.87%               5.87%    
Early termination premium                 $ 23,000,000            
Debt prepayment cost     503,000,000                        
Debt prepayment, accrued interest     $ 5,000,000                        
Interest expense                     $ 4,000,000        
5.400% Notes, due 2021                              
Debt Instrument [Line Items]                              
Early redemption of debt       $ 361,000,000 $ 589,000,000 $ 300,000,000                  
Long- term debt, interest rate       5.40% 5.40% 5.40%             5.40%    
Early termination premium       $ 5,000,000                      
Debt prepayment cost           $ 315,000,000                  
Interest expense                   $ 24,000,000          
6.150% Notes, due 2020                              
Debt Instrument [Line Items]                              
Early redemption of debt           $ 1,000,000,000                  
Long- term debt, interest rate           6.15%                  
Debt prepayment cost           $ 1,020,000,000