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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Apr. 17, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]        
Payments to retire debt instruments   $ 38,000,000    
Senior Note Due 4/15/2017 [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Payments to retire debt instruments $ 210,000,000      
Interest Rate 8.25%      
Senior Debt Due 10/12/2021        
Debt Instrument [Line Items]        
Interest Rate [1]   3.74%   4.145%
Debt instrument, maturity date [1]   Oct. 12, 2021    
Verizon Bridge Facility [Member]        
Debt Instrument [Line Items]        
Interest expense     $ 10,000,000  
Senior Notes and Debentures [Member] | Senior Note Due 9/15/2020 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 1,000,000,000    
Interest Rate   8.875%   8.875%
Debt instrument, maturity date   Sep. 15, 2020    
Senior Notes and Debentures [Member] | Senior Note Due 9/15/2022 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 2,000,000,000    
Interest Rate   10.50%   10.50%
Debt instrument, maturity date   Sep. 15, 2022    
Issue price expressed as a percentage of principal amount (in hundredths)   100.00%    
Senior Notes and Debentures [Member] | Senior Note Due 9/15/2025 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 3,600,000,000    
Interest Rate   11.00%   11.00%
Debt instrument, maturity date   Sep. 15, 2025    
Subsidiary Debt [Member] | Subsidiary Senior Note Due 5/15/2027 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 200,000,000    
Interest Rate   6.75%   6.75%
Debt instrument, maturity date   May 15, 2027    
Subsidiary Debt [Member] | Subsidiary Senior Note Due 2/1/2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 300,000,000    
Interest Rate   6.86%   6.86%
Debt instrument, maturity date   Feb. 01, 2028    
Subsidiary Debt [Member] | Subsidiary Senior Note Due 11/15/2031 [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 100,000,000    
Interest Rate   8.50%   8.50%
Debt instrument, maturity date   Nov. 15, 2031    
JP Morgan Revolving Credit Facility 2015 [Member]        
Debt Instrument [Line Items]        
Line of credit facility maximum borrowing capacity   $ 850,000,000   $ 750,000,000
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Initial Covenant Period   5.25%    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Second Covenant Period   5.00%    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Third Covenant Period   4.75%    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Fourth Covenant Period   4.50%    
CoBank Credit Facility Member | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   3.875%    
CoBank Term Loan 2014 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 350,000,000    
Repayment of the outstanding principal balance, quarterly installments amount   9,000,000    
CoBank Term Loan 2016 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   315,000,000    
Repayment of the outstanding principal balance, quarterly installments amount   $ 8,000,000    
Minimum [Member] | JP Morgan Revolving Credit Facility 2015 [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   0.75%    
Minimum [Member] | JP Morgan Revolving Credit Facility 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   1.75%    
Minimum [Member] | CoBank Credit Facility Member | Base Rate [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   0.875%    
Minimum [Member] | CoBank Credit Facility Member | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   1.875%    
Maximum [Member] | JP Morgan Revolving Credit Facility 2015 [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   1.75%    
Maximum [Member] | JP Morgan Revolving Credit Facility 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   2.75%    
Maximum [Member] | CoBank Credit Facility Member | Base Rate [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   3.875%    
Maximum [Member] | CoBank Credit Facility Member | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Interest Rate Margin   4.875%    
CTF Transaction [Member] | Senior And Subsidiary Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 6,600,000,000    
CTF Transaction [Member] | Subsidiary Debt [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 600,000,000    
[1] Represents borrowings under the 2016 CoBank Credit Agreement, as defined below.