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Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 15, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
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   101        
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   5.35%   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%