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Debt (Long Term Debt Narrative) (Details) - USD ($)
1 Months Ended 4 Months Ended 10 Months Ended 12 Months Ended
Aug. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
May 31, 2019
Sep. 30, 2017
Aug. 31, 2017
Jun. 30, 2008
Feb. 28, 2017
Feb. 28, 2017
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2018
Dec. 31, 2017
Mar. 01, 2017
Nov. 30, 2016
May 31, 2016
Debt Instrument [Line Items]                                
Long-term debt                   $ 9,755,000,000            
Line of credit                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity                       $ 1,000,000,000        
$3.75 billion ABL facility expiring 2024 | Line of credit                                
Debt Instrument [Line Items]                                
Debt instrument, term             5 years                  
Maximum borrowing capacity             $ 1,250,000,000     3,750,000,000            
Long-term debt                   $ 977,000,000 $ 1,638,000,000          
Debt instrument, covenant terms, fixed charge percentage                   10.00%            
Term loan facility expiring 2025                                
Debt Instrument [Line Items]                                
Debt instrument, annual repayment rate                   1.00%            
Long-term debt                   $ 971,000,000 979,000,000          
5 7/8 percent Senior Notes due 2026 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 999,000,000 999,000,000          
Stated interest rate                   5.875%            
5 1/2 percent Senior Notes due 2027 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 994,000,000 992,000,000          
Stated interest rate                   5.50%            
3 7/8 percent Senior Secured Notes due 2027 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 742,000,000 741,000,000          
Stated interest rate     3.875%             3.875%            
4 7/8 percent Senior Notes due 2028 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 1,654,000,000 1,652,000,000          
Stated interest rate                   4.875%            
4 7/8 percent Senior Notes due 2028 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 4,000,000 4,000,000          
Stated interest rate                   4.875%            
5 1/4 percent Senior Notes due 2030 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 742,000,000 741,000,000          
Stated interest rate                   5.25%            
4 percent Senior Notes due 2030 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 742,000,000 0          
Stated interest rate                   4.00%            
3 7/8 percent Senior Notes due 2031 | Senior notes                                
Debt Instrument [Line Items]                                
Long-term debt                   $ 1,088,000,000 0          
Stated interest rate                   3.875%            
London Interbank Offered Rate (LIBOR) | Term loan facility expiring 2025                                
Debt Instrument [Line Items]                                
Debt instrument, basis spread on variable rate                   1.75%            
Base Rate | Term loan facility expiring 2025                                
Debt Instrument [Line Items]                                
Debt instrument, basis spread on variable rate                   0.75%            
Subsidiaries | 5 7/8 percent Senior Notes due 2026 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount               $ 250,000,000 $ 250,000,000             $ 750,000,000
Outstanding principal amount of debt                           $ 1,000,000,000.0    
Proceeds from debt, net of issuance costs                 $ 999,000,000              
Debt instrument, unamortized premium                   $ 8,000,000            
Effective interest rate                   5.70%            
Subsidiaries | 5 7/8 percent Senior Notes due 2026 | Senior notes | Period commencing in 2021                                
Debt Instrument [Line Items]                                
Debt redemption percentage                 102.938%              
Subsidiaries | 5 7/8 percent Senior Notes due 2026 | Senior notes | Period commencing in 2024                                
Debt Instrument [Line Items]                                
Debt redemption percentage                 100.00%              
Subsidiaries | 5 7/8 percent Senior Notes due 2026 | Senior notes | In the event of change of control                                
Debt Instrument [Line Items]                                
Debt redemption percentage                 101.00%              
Subsidiaries | 5 1/2 percent Senior Notes due 2027 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount               250,000,000 $ 250,000,000         $ 1,000,000,000.0 $ 750,000,000  
Proceeds from debt, net of issuance costs               $ 991,000,000                
Debt instrument, unamortized premium                   $ 2,000,000            
Effective interest rate                   5.50%            
Subsidiaries | 5 1/2 percent Senior Notes due 2027 | Senior notes | In the event of change of control                                
Debt Instrument [Line Items]                                
Debt redemption percentage               101.00%                
Subsidiaries | 5 1/2 percent Senior Notes due 2027 | Senior notes | Period commencing in 2022                                
Debt Instrument [Line Items]                                
Debt redemption percentage               102.75%                
Subsidiaries | 5 1/2 percent Senior Notes due 2027 | Senior notes | Period commencing in 2025                                
Debt Instrument [Line Items]                                
Debt redemption percentage               100.00%                
Subsidiaries | 3 7/8 percent Senior Secured Notes due 2027 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount     $ 750,000,000               $ 750,000,000          
Proceeds from debt, net of issuance costs     $ 741,000,000                          
Debt redemption percentage     40.00%                          
Subsidiaries | 3 7/8 percent Senior Secured Notes due 2027 | Senior notes | In the event of change of control                                
Debt Instrument [Line Items]                                
Debt redemption percentage     101.00%                          
Subsidiaries | 3 7/8 percent Senior Secured Notes due 2027 | Senior notes | Period commencing in 2022                                
Debt Instrument [Line Items]                                
Debt redemption percentage     101.938%                          
Subsidiaries | 3 7/8 percent Senior Secured Notes due 2027 | Senior notes | Period commencing in 2025                                
Debt Instrument [Line Items]                                
Debt redemption percentage     100.00%                          
Subsidiaries | 3 7/8 percent Senior Secured Notes due 2027 | Senior notes | On or prior to January 15, 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage     103.875%                          
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount           $ 925,000,000                    
Proceeds from debt, net of issuance costs           $ 913,000,000                    
Debt instrument, unamortized premium                   $ 1,000,000            
Effective interest rate                   4.86%            
Amount exchanged for equivalent notes                         $ 744,000,000      
Long-term debt                   $ 1,669,000,000            
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | In the event of change of control                                
Debt Instrument [Line Items]                                
Debt redemption percentage           101.00%                    
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | Period commencing in 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage           102.438%                    
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | Period commencing in 2026                                
Debt Instrument [Line Items]                                
Debt redemption percentage           100.00%                    
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount         $ 750,000,000                      
Proceeds from debt, net of issuance costs         $ 743,000,000                      
Effective interest rate                   4.84%            
Long-term debt                   $ 4,000,000            
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | In the event of change of control                                
Debt Instrument [Line Items]                                
Debt redemption percentage         101.00%                      
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | Period commencing in 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage         102.438%                      
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes | Period commencing in 2026                                
Debt Instrument [Line Items]                                
Debt redemption percentage         100.00%                      
Subsidiaries | 5 1/4 percent Senior Notes due 2030 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount       $ 750,000,000                        
Proceeds from debt, net of issuance costs       $ 741,000,000                        
Debt redemption percentage       101.00%                        
Debt redemption percentage of principal amount redeemed       40.00%                        
Subsidiaries | 5 1/4 percent Senior Notes due 2030 | Senior notes | Period commencing in 2025                                
Debt Instrument [Line Items]                                
Debt redemption percentage       102.625%                        
Subsidiaries | 5 1/4 percent Senior Notes due 2030 | Senior notes | Period commencing in 2028                                
Debt Instrument [Line Items]                                
Debt redemption percentage       100.00%                        
Subsidiaries | 5 1/4 percent Senior Notes due 2030 | Senior notes | On or prior to January 15, 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage       105.25%                        
Subsidiaries | 4 percent Senior Notes due 2030 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount   $ 750,000,000                            
Proceeds from debt, net of issuance costs   $ 741,000,000                            
Debt redemption percentage   101.00%                            
Debt redemption percentage of principal amount redeemed   40.00%                            
Stated interest rate   4.00%                            
Subsidiaries | 4 percent Senior Notes due 2030 | Senior notes | Period commencing in 2025                                
Debt Instrument [Line Items]                                
Debt redemption percentage   102.00%                            
Subsidiaries | 4 percent Senior Notes due 2030 | Senior notes | Period commencing in 2028                                
Debt Instrument [Line Items]                                
Debt redemption percentage   100.00%                            
Subsidiaries | 4 percent Senior Notes due 2030 | Senior notes | On or prior to January 15, 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage   104.00%                            
Subsidiaries | 3 7/8 percent Senior Notes due 2031 | Senior notes                                
Debt Instrument [Line Items]                                
Debt instrument, face amount $ 1,100,000,000                              
Proceeds from debt, net of issuance costs $ 1,087,000,000.000                              
Debt redemption percentage 101.00%                              
Debt redemption percentage of principal amount redeemed 40.00%                              
Subsidiaries | 3 7/8 percent Senior Notes due 2031 | Senior notes | Period commencing in 2025                                
Debt Instrument [Line Items]                                
Debt redemption percentage 101.938%                              
Subsidiaries | 3 7/8 percent Senior Notes due 2031 | Senior notes | Period commencing in 2028                                
Debt Instrument [Line Items]                                
Debt redemption percentage 100.00%                              
Subsidiaries | 3 7/8 percent Senior Notes due 2031 | Senior notes | On or prior to January 15, 2023                                
Debt Instrument [Line Items]                                
Debt redemption percentage 103.875%