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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Nov. 25, 2020
Oct. 08, 2020
Aug. 13, 2020
May 15, 2020
Oct. 01, 2018
Jul. 03, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Mar. 15, 2019
Mar. 19, 2018
Debt Instrument [Line Items]                        
Interest rate             5.944%          
Payment to retire debt instruments             $ 5,697,000,000          
Gains (Loss) on early extinguishment of debt             $ (72,000,000) $ (20,000,000) $ 32,000,000      
Financing obligation for contributions of real property to pension plan                 37,000,000      
Pension Building Contribution Aggregate Annual Rent                 5,000,000      
Lease term of contributed property             20 years          
Gain (loss) on contribution of property to defined benefit                   $ 0    
Proceeds from long-term debt borrowings             $ 4,950,000,000 1,650,000,000 1,840,000,000      
Remaining outstanding principal             16,769,000,000 $ 17,516,000,000        
Sale leaseback transaction             $ 37,000,000          
DIP Revolving Facility [Member]                        
Debt Instrument [Line Items]                        
DIP, Letters of credit outstanding   $ 90,000,000                    
DIP, Remaining borrowing capacity   535,000,000                    
DIP, Maximum line of credit   $ 625,000,000 $ 625,000,000 $ 460,000,000                
DIP Revolving Facility [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin   3.25%                    
DIP Revolving Facility [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin   2.25%                    
Exit Revolving Facility [Member]                        
Debt Instrument [Line Items]                        
Days prior to maturity to meet threshold to not accelerate debt             91 days          
Period of conversion             4 years          
Exit Revolving Facility [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin   3.50%                    
Exit Revolving Facility [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin   2.50%                    
DIP Term Loan Facility [Member]                        
Debt Instrument [Line Items]                        
DIP, Remaining borrowing capacity $ 1,250,000,000                      
DIP, Maximum line of credit 750,000,000 $ 500,000,000                    
Proceeds from long-term debt borrowings $ 750,000,000                      
DIP Term Loan Facility [Member] | LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin 4.75%                      
DIP Term Loan Facility [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin 3.75%                      
DIP Term Loan Facility [Member] | LIBOR Floor Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate margin 1.00%                      
Exit Agreement (The Incremental DIP Term Loan Amendment) [Member]                        
Debt Instrument [Line Items]                        
DIP, Maximum line of credit $ 750,000,000                      
Term Loan Due 06/15/2024 [Member]                        
Debt Instrument [Line Items]                        
Proceeds from long-term debt borrowings           $ 240,000,000            
Senior Unsecured Debt [Member]                        
Debt Instrument [Line Items]                        
Payments to retire debt                 117,000,000      
Payment to retire debt instruments                 $ 2,198,000,000      
Senior Unsecured Debt [Member] | Senior Note Due 3/15/2019 [Member]                        
Debt Instrument [Line Items]                        
Interest rate               7.125%        
Debt Instrument, Maturity Date             Mar. 15, 2020          
Payment to retire debt instruments               $ 348,000,000        
Secured Debt [Member]                        
Debt Instrument [Line Items]                        
Remaining outstanding principal             $ 4,964,000,000 $ 5,711,000,000        
Secured Debt [Member] | DIP Revolving Facility [Member]                        
Debt Instrument [Line Items]                        
DIP, Maximum line of credit   $ 500,000,000                    
Secured Debt [Member] | Second Lien Notes Due 4/1/2026 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                       $ 1,600,000,000
Interest rate             8.50% 8.50%       8.50%
Debt Instrument, Maturity Date             Apr. 01, 2026          
Payment to retire debt instruments             $ 1,600,000,000          
Remaining outstanding principal               $ 1,600,000,000        
Secured Debt [Member] | Term Loan Due 06/15/2024 [Member]                        
Debt Instrument [Line Items]                        
Interest rate               5.55%        
Debt Instrument, Maturity Date             Jun. 15, 2024          
Remaining outstanding principal               $ 1,699,000,000        
Secured Debt [Member] | First Lien Notes Due 4/1/2027 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                     $ 1,650,000,000  
Interest rate               8.00%     8.00%  
Debt Instrument, Maturity Date             Apr. 01, 2027          
Payment to retire debt instruments             $ 1,650,000,000          
Remaining outstanding principal               $ 1,650,000,000        
Secured Debt [Member] | Revolver Due 2/27/2024 [Member]                        
Debt Instrument [Line Items]                        
Interest rate               4.76%        
Debt Instrument, Maturity Date             Feb. 27, 2024          
Payment to retire debt instruments             $ 749,000,000          
Remaining outstanding principal               $ 749,000,000        
Secured Debt [Member] | DIP-to-Exit First Lien Notes Due 10/15/2027 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 1,150,000,000          
Interest rate             5.875%          
Debt Instrument, Maturity Date             Oct. 15, 2027          
Remaining outstanding principal             $ 1,150,000,000          
Maximum percent of redeemable notes   40.00%                    
Percent of redemption price equal to principal amount   105.875%                    
Percent of purchase price of the principal amount   101.00%                    
Secured Debt [Member] | DIP-to-Exit Second Lien Notes Due 5/1/2029 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 1,000,000,000          
Interest rate             6.75%          
Debt Instrument, Maturity Date             May 01, 2029          
Remaining outstanding principal             $ 1,000,000,000          
Maximum percent of redeemable notes 40.00%                      
Percent of redemption price equal to principal amount 106.75%                      
Percent of purchase price of the principal amount 101.00%                      
Secured Debt [Member] | DIP-to-Exit First Lien Notes Due 5/1/2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 1,550,000,000                      
Interest rate             5.00%          
Debt Instrument, Maturity Date             May 01, 2028          
Remaining outstanding principal             $ 1,550,000,000          
Maximum percent of redeemable notes 40.00%                      
Percent of redemption price equal to principal amount 105.00%                      
Percent of purchase price of the principal amount 101.00%                      
Unsecured Debt [Member]                        
Debt Instrument [Line Items]                        
Remaining outstanding principal             $ 10,949,000,000 $ 10,949,000,000        
Unsecured Debt [Member] | Senior Note Due 7/1/2021 [Member]                        
Debt Instrument [Line Items]                        
Interest rate             9.25% 9.25%        
Debt Instrument, Maturity Date             Jul. 01, 2021          
Remaining outstanding principal             $ 89,000,000 $ 89,000,000        
Unsecured Debt [Member] | Senior Note Due 9/15/2021 [Member]                        
Debt Instrument [Line Items]                        
Interest rate             6.25% 6.25%        
Debt Instrument, Maturity Date             Sep. 15, 2021          
Remaining outstanding principal             $ 220,000,000 $ 220,000,000        
Unsecured Debt [Member] | Senior Notes Due 10/1/2018 [Member]                        
Debt Instrument [Line Items]                        
Interest rate                 8.125%      
Debt Instrument, Maturity Date             Oct. 01, 2018   Oct. 01, 2018      
Payments to retire debt                 $ 61,000,000      
Payment to retire debt instruments         $ 431,000,000              
Unsecured Debt [Member] | Senior Note Due 9/15/2020 [Member]                        
Debt Instrument [Line Items]                        
Interest rate             8.875% 8.875%        
Debt Instrument, Maturity Date             Sep. 15, 2020          
Payment to retire debt instruments                 $ 249,000,000      
Remaining outstanding principal             $ 55,000,000 $ 55,000,000        
Unsecured Debt [Member] | Senior Note Due 3/15/2019 [Member]                        
Debt Instrument [Line Items]                        
Interest rate                 7.125%      
Debt Instrument, Maturity Date                 Mar. 15, 2019      
Payments to retire debt               $ 56,000,000        
Unsecured Debt [Member] | Senior Note Due 4/15/2020 [Member]                        
Debt Instrument [Line Items]                        
Interest rate             8.50% 8.50% 8.50%      
Debt Instrument, Maturity Date             Apr. 15, 2020          
Payment to retire debt instruments                 $ 447,000,000      
Remaining outstanding principal             $ 172,000,000 $ 172,000,000        
Unsecured Debt Excluding Open Market Purchases [Member]                        
Debt Instrument [Line Items]                        
Payment to retire debt instruments                 $ 1,651,000,000      
Unsecured Debt Excluding Open Market Purchases [Member] | Senior Note Due 7/1/2021 [Member]                        
Debt Instrument [Line Items]                        
Interest rate                 9.25%      
Payment to retire debt instruments                 $ 400,000,000      
Unsecured Debt Excluding Open Market Purchases [Member] | Senior Note Due 9/15/2021 [Member]                        
Debt Instrument [Line Items]                        
Interest rate                 6.25%      
Debt Instrument, Maturity Date             Sep. 15, 2021          
Payment to retire debt instruments                 $ 555,000,000      
Unsecured Debt Excluding Open Market Purchases [Member] | Senior Note Due 9/15/2020 [Member]                        
Debt Instrument [Line Items]                        
Interest rate                 8.875%      
Debt Instrument, Maturity Date             Sep. 15, 2020          
JP Morgan Term Loan A [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 1,625,000,000          
JP Morgan Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 850,000,000          
Debt Instrument, Maturity Date             Feb. 27, 2024          
CoBank Term Loan 2016 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount           315,000,000            
CoBank Term Loan 2014 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount           $ 350,000,000            
JP Morgan Term Loan B [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 1,740,000,000           $ 1,740,000,000          
Debt Instrument, Maturity Date             Jun. 15, 2024