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Debt (Long Term Debt Narrative) (Details) - USD ($)
1 Months Ended 4 Months Ended 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
May 31, 2019
Sep. 30, 2017
Aug. 31, 2017
Jun. 30, 2008
Feb. 28, 2017
Dec. 31, 2021
Dec. 31, 2020
Oct. 31, 2018
Dec. 31, 2017
Mar. 01, 2017
Nov. 30, 2016
Debt Instrument [Line Items]                              
Long-term debt                   $ 9,754,000,000          
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                   $ 1,029,000,000 $ 977,000,000        
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                   $ 962,000,000 971,000,000        
5 1/2 percent Senior Notes due 2027 | Senior notes                              
Debt Instrument [Line Items]                              
Long-term debt                   $ 995,000,000 994,000,000        
Stated interest rate                   5.50%          
3 7/8 percent Senior Secured Notes due 2027 | Senior notes                              
Debt Instrument [Line Items]                              
Long-term debt                   $ 743,000,000 742,000,000        
Stated interest rate                   3.875%          
4 7/8 percent Senior Notes due 2028 | Senior notes                              
Debt Instrument [Line Items]                              
Long-term debt                   $ 1,656,000,000 1,654,000,000        
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                   $ 743,000,000 742,000,000        
Stated interest rate                   5.25%          
4 percent Senior Notes due 2030 | Senior notes                              
Debt Instrument [Line Items]                              
Long-term debt                   $ 743,000,000 742,000,000        
Stated interest rate                   4.00%          
3 7/8 percent Senior Notes due 2031 | Senior notes                              
Debt Instrument [Line Items]                              
Long-term debt                   $ 1,089,000,000 1,088,000,000        
Stated interest rate                   3.875%          
Senior Notes 3.75 Percent | Senior notes                              
Debt Instrument [Line Items]                              
Debt instrument, face amount $ 750,000,000                            
Long-term debt                   $ 743,000,000 $ 0        
Stated interest rate                   3.75%          
Senior Notes 3.75 Percent | Senior notes | Period commencing in 2026                              
Debt Instrument [Line Items]                              
Debt redemption percentage 101.875%                            
Senior Notes 3.75 Percent | Senior notes | On or prior to January 15, 2023                              
Debt Instrument [Line Items]                              
Debt redemption percentage 103.75%                            
Debt redemption percentage of principal amount redeemed 40.00%                            
Senior Notes 3.75 Percent | Senior notes | Period commencing 2029                              
Debt Instrument [Line Items]                              
Debt redemption percentage 100.00%                            
Senior Notes 3.75 Percent | Senior notes | Period commencing in 2020                              
Debt Instrument [Line Items]                              
Debt redemption percentage of principal amount redeemed 101.00%                            
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 1/2 percent Senior Notes due 2027 | Senior notes                              
Debt Instrument [Line Items]                              
Debt instrument, face amount                 $ 250,000,000         $ 1,000,000,000 $ 750,000,000
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                      
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                
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                  
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                    
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                        
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                          
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%