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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Apr. 01, 2016
Oct. 31, 2016
Apr. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]            
Accrued financing liabilities           $ 184,000,000
Short-term Debt, Refinanced, Amount       $ 354,000,000    
Senior Note Due 4/15/2017 [Member] | Non Cash Debt Exchange Member            
Debt Instrument [Line Items]            
Debt Conversion, Original Debt, Amount       $ 167,000,000    
Debt Conversion, Original Debt, Interest Rate of Debt       8.25%    
Extinguishment of Debt, Gain (Loss), Net of Tax       $ 7,000,000    
Senior Note Due 4/15/2017 [Member] | Subsequent Event [Member] | Non Cash Debt Exchange Member            
Debt Instrument [Line Items]            
Debt Conversion, Original Debt, Amount   $ 84,000,000        
Debt Conversion, Original Debt, Interest Rate of Debt   8.25%        
Senior Note Due 9/15/2020 [Member] | Subsequent Event [Member] | Non Cash Debt Exchange Member            
Debt Instrument [Line Items]            
Debt Conversion, Converted Instrument, Amount   $ 66,000,000        
Debt Conversion, Converted Instrument, Rate   8.875%        
Senior Note Due 9/15/2022 [Member] | Non Cash Debt Exchange Member            
Debt Instrument [Line Items]            
Debt Conversion, Converted Instrument, Amount       $ 171,000,000    
Debt Conversion, Converted Instrument, Rate   10.50%   10.50%    
Senior Note Due 9/15/2022 [Member] | Subsequent Event [Member] | Non Cash Debt Exchange Member            
Debt Instrument [Line Items]            
Debt Conversion, Converted Instrument, Amount   $ 17,000,000        
Verizon Bridge Facility [Member]            
Debt Instrument [Line Items]            
Interest expense       $ 10,000,000 $ 184,000,000  
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%    
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%    
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%    
Debt instrument, maturity date       Nov. 15, 2031    
2015 JP Morgan Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 1,625,000,000   $ 1,500,000,000
Debt instrument, maturity date       Mar. 31, 2021    
Proceeds from debt, net of issuance costs $ 1,550,000,000   $ 75,000,000      
Repayment of the outstanding principal balance, quarterly installments amount       $ 20,000,000    
Increased periodic payment       $ 41,000,000    
2016 COBANK Credit Agreement [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Repayment of the outstanding principal balance, quarterly installments amount   8,000,000        
2016 COBANK Credit Agreement [Member] | Senior Note Due 10/24/2019 [Member]            
Debt Instrument [Line Items]            
Debt instrument, maturity date       Oct. 24, 2019    
2016 COBANK Credit Agreement [Member] | Senior Note Due 10/12/2021 [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Line of credit facility maximum borrowing capacity   $ 315,000,000        
Debt instrument, maturity date   Oct. 12, 2021        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit facility maximum borrowing capacity       $ 750,000,000    
Debt instrument, maturity date       May 31, 2018    
Line of credit facility, current borrowings       $ 0    
Minimum [Member] | 2015 JP Morgan Credit Agreement [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       0.75%    
Minimum [Member] | 2015 JP Morgan Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Initial pricing for LIBOR based borrowings (in hundredths)       1.75%    
Minimum [Member] | 2016 COBANK Credit Agreement [Member] | Base Rate [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin   0.875%        
Minimum [Member] | 2016 COBANK Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin   1.875%        
Maximum [Member] | 2015 JP Morgan Credit Agreement [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       1.75%    
Maximum [Member] | 2015 JP Morgan Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Initial pricing for LIBOR based borrowings (in hundredths)       2.75%    
Maximum [Member] | 2016 COBANK Credit Agreement [Member] | Base Rate [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin   2.875%        
Maximum [Member] | 2016 COBANK Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin   3.875%        
Verizon Transaction [Member] | Senior And Subsidiary Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 6,600,000,000   $ 6,600,000,000
Verizon Transaction [Member] | Subsidiary Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 600,000,000