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Long Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 15, 2019
Jul. 03, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mar. 19, 2018
Debt Instrument [Line Items]            
Payments to retire debt instruments     $ 2,270,000,000      
Line of credit facility, current borrowings     375,000,000      
Loss on extinguishment of debt     (20,000,000) $ 33,000,000    
Proceeds from long-term debt borrowings     1,650,000,000 $ 1,600,000,000    
Remaining outstanding principal     17,155,000,000   $ 17,400,000,000  
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility, current borrowings     70,000,000      
Senior Unsecured Debt [Member] | Senior Note Due 3/15/2019 [Member]            
Debt Instrument [Line Items]            
Payments to retire debt instruments     $ 348,000,000      
Interest Rate     7.125%      
Senior Unsecured Debt [Member] | Senior Notes Due 2020 [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     $ 227,000,000      
Senior Unsecured Debt [Member] | Senior Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     309,000,000      
Secured Debt [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     5,350,000,000   $ 5,246,000,000  
Secured Debt [Member] | First Lien Notes Due 4/1/2027 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount     $ 1,650,000,000      
Debt instrument, maturity date     Apr. 01, 2027      
Interest Rate     8.00%      
Remaining outstanding principal     $ 1,650,000,000      
Secured Debt [Member] | Second Lien Notes Due 4/1/2026 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 1,600,000,000
Debt instrument, maturity date     Apr. 01, 2026      
Interest Rate     8.50%   8.50% 8.50%
Remaining outstanding principal     $ 1,600,000,000   $ 1,600,000,000  
Secured Debt [Member] | Term Loan Due 3/31/2021 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Mar. 31, 2021      
Interest Rate         5.28%  
Remaining outstanding principal         $ 1,402,000,000  
Secured Debt [Member] | Term Loan Due 10/12/2021 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Oct. 12, 2021      
Interest Rate         7.405%  
Remaining outstanding principal         $ 239,000,000  
Secured Debt [Member] | Term Loan Due 6/15/2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Jun. 15, 2024      
Interest Rate     6.25%   6.28%  
Remaining outstanding principal     $ 1,712,000,000   $ 1,716,000,000  
Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     $ 10,949,000,000   $ 11,297,000,000  
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     $ 89,000,000   $ 89,000,000  
Unsecured Debt [Member] | Senior Note Due 3/15/2019 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Mar. 15, 2019      
Interest Rate         7.125%  
Remaining outstanding principal         $ 348,000,000  
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     $ 172,000,000   $ 172,000,000  
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     $ 55,000,000   $ 55,000,000  
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     $ 220,000,000   $ 220,000,000  
Secured Subsidiary Debt [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     106,000,000   107,000,000  
Unsecured Subsidiary Debt [Member]            
Debt Instrument [Line Items]            
Remaining outstanding principal     $ 750,000,000   $ 750,000,000  
JP Morgan Combined Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Acceleration Clause     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.      
Days Prior To Maturity To Meet Threshold To Not Accelerate Debt     91 days      
Maximum Debt Threshold To Not Accelerate Debt     $ 500,000,000      
JP Morgan Revolving Credit Facility 2015 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date         Feb. 27, 2022  
Line of credit facility maximum borrowing capacity     $ 850,000,000      
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] | Secured Revolving Debt Due 2/27/2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Feb. 27, 2024      
Increased interest rate 0.25%          
JP Morgan Term Loan A [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount     $ 1,740,000,000   $ 1,625,000,000  
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%      
JP Morgan Term Loan B [Member] | Term Loan Due 6/15/2024 [Member]            
Debt Instrument [Line Items]            
Proceeds from long-term debt borrowings   $ 240,000,000        
CoBank Term Loan 2016 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 315,000,000  
Minimum [Member] | JP Morgan Term Loan A and Revolver [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate margin     1.00%      
Minimum [Member] | JP Morgan Term Loan A and Revolver [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Interest rate margin     2.00%      
Maximum [Member] | JP Morgan Term Loan A and Revolver [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate margin     2.00%      
Maximum [Member] | JP Morgan Term Loan A and Revolver [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Interest rate margin     3.00%