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Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 15, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Jul. 03, 2018
Debt Instrument [Line Items]              
Payments to retire debt instruments   $ 5          
Line of credit facility, current borrowings   749          
Loss on extinguishment of debt       $ 20      
Remaining outstanding principal   17,511   17,516      
Letter of Credit [Member]              
Debt Instrument [Line Items]              
Line of credit facility, current borrowings   90          
Senior Unsecured Debt [Member] | Senior Note Due 3/15/2019 [Member]              
Debt Instrument [Line Items]              
Payments to retire debt instruments   $ 5 $ 348        
Debt instrument, maturity date   Mar. 15, 2019          
Interest rate     7.125%        
Senior Unsecured Debt [Member] | Senior Notes Due 2020 [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   $ 227          
Senior Unsecured Debt [Member] | Senior Notes Due 2021 [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   309          
Secured Debt [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   $ 5,706   $ 5,711      
Secured Debt [Member] | First Lien Notes Due 4/1/2027 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 1,650  
Debt instrument, maturity date   Apr. 01, 2027          
Interest rate   8.00%   8.00%   8.00%  
Remaining outstanding principal   $ 1,650   $ 1,650      
Secured Debt [Member] | Second Lien Notes Due 4/1/2026 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Apr. 01, 2026          
Interest rate   8.50%   8.50%      
Remaining outstanding principal   $ 1,600   $ 1,600      
Secured Debt [Member] | Term Loan Due 6/15/2024 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Jun. 15, 2024          
Interest rate   5.352%   5.55%      
Remaining outstanding principal   $ 1,694   $ 1,699      
Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   $ 10,949   $ 10,949      
Unsecured Debt [Member] | Senior Note Due 7/1/2021 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Jul. 01, 2021          
Interest rate   9.25%   9.25%      
Remaining outstanding principal   $ 89   $ 89      
Unsecured Debt [Member] | Senior Note Due 4/15/2020 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Apr. 15, 2020          
Interest rate   8.50%   8.50%      
Remaining outstanding principal   $ 172   $ 172      
Unsecured Debt [Member] | Senior Note Due 9/15/2020 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Sep. 15, 2020          
Interest rate   8.875%   8.875%      
Remaining outstanding principal   $ 55   $ 55      
Unsecured Debt [Member] | Senior Note Due 9/15/2021 [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Sep. 15, 2021          
Interest rate   6.25%   6.25%      
Remaining outstanding principal   $ 220   $ 220      
Secured Subsidiary Debt [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   106   106      
Unsecured Subsidiary Debt [Member]              
Debt Instrument [Line Items]              
Remaining outstanding principal   $ 750   $ 750      
JP Morgan Term Loan B and Revolver [Member]              
Debt Instrument [Line Items]              
Acceleration cause   The maturities of the Term Loan B and the Revolver, in each case if still outstanding, will be accelerated in the following circumstances: (i) if, 91 days before the maturity date of any series of Senior Notes maturing in 2020, 2023 and 2024, more than $500 million in principal amount remains outstanding on such series; or (ii) if, 91 days before the maturity date of the first series of Senior Notes maturing in 2021 or 2022, more than $500 million in principal amount remains outstanding, in the aggregate, on the two series of Senior Notes maturing in such year.          
JP Morgan Term Loan B and Revolver [Member] | Senior Notes Maturing In 2020, 2023, And 2024 [Member]              
Debt Instrument [Line Items]              
Days prior to maturity to meet threshold to not accelerate debt   91 days          
Maximum debt threshold to not accelerate debt   $ 500          
JP Morgan Term Loan B and Revolver [Member] | Senior Notes Maturing In 2021 Or 2022 [Member]              
Debt Instrument [Line Items]              
Days prior to maturity to meet threshold to not accelerate debt   91 days          
Maximum debt threshold to not accelerate debt   $ 500          
JP Morgan Revolving Credit Facility 2015 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 850          
Debt instrument, maturity date   Feb. 27, 2024          
JP Morgan Revolving Credit Facility 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Effective basis spread   3.00%          
JP Morgan Revolving Credit Facility 2015 [Member] | Senior Unsecured Debt [Member] | Senior Notes Due 2024 [Member]              
Debt Instrument [Line Items]              
Maximum debt threshold to not accelerate debt $ 500            
Increased interest rate 0.25%            
JP Morgan Revolving Credit Facility 2015 [Member] | Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt instrument, maturity date       Feb. 27, 2024 Feb. 27, 2022    
JP Morgan Term Loan A [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount       $ 1,625      
JP Morgan Term Loan A [Member] | Senior Note Due 3/31/2021              
Debt Instrument [Line Items]              
Debt instrument, maturity date   Mar. 01, 2021          
JP Morgan Term Loan B [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 1,740          
Debt instrument, maturity date   Jun. 15, 2024          
JP Morgan Term Loan B [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Interest rate margin   2.75%          
JP Morgan Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Interest rate margin   3.75%          
CoBank Term Loan 2014 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount             $ 350
CoBank Term Loan 2016 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount             $ 315
Debt instrument, maturity date   Oct. 01, 2021          
Minimum [Member] | JP Morgan Term Loan B and Revolver [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Interest rate margin   1.00%          
Minimum [Member] | JP Morgan Term Loan B and Revolver [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Interest rate margin   2.00%          
Maximum [Member] | JP Morgan Term Loan B and Revolver [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Interest rate margin   2.00%          
Maximum [Member] | JP Morgan Term Loan B and Revolver [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Interest rate margin   3.00%