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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Apr. 01, 2016
Apr. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
Accrued financing liabilities         $ 184,000,000
Verizon Bridge Facility [Member]          
Debt Instrument [Line Items]          
Interest expense     $ 10,000,000 $ 132,000,000  
Senior Notes and Debentures [Member] | Senior Note Due 10/14/2016 [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount     575,000,000    
Senior Notes and Debentures [Member] | Senior Note Due 10/24/2019 [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount     350,000,000    
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    
Issue price expressed as a percentage of principal amount (in hundredths)     100.00%    
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    
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%    
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%    
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