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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 17, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Payments to retire debt instruments       $ 1,576,000,000    
Line of credit facility, current borrowings   $ 0   $ 0    
Senior Note Due 4/15/2017 [Member]            
Debt Instrument [Line Items]            
Payments to retire debt instruments $ 210,000,000          
Interest Rate 8.25%          
Senior Note Due 4/15/2020 [Member]            
Debt Instrument [Line Items]            
Early Repayment of Senior Debt   527,000,000        
Senior Note Due 9/15/2020 [Member]            
Debt Instrument [Line Items]            
Early Repayment of Senior Debt   $ 763,000,000        
Senior Debt Due 10/12/2021            
Debt Instrument [Line Items]            
Debt instrument, maturity date [1]       Oct. 12, 2021    
Interest Rate [1]   5.105%   5.105%   4.145%
Verizon Bridge Facility [Member]            
Debt Instrument [Line Items]            
Interest expense         $ 10,000,000  
Senior And Subsidiary Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Payments to retire debt instruments       $ 1,500,000,000    
Senior Notes and Debentures [Member]            
Debt Instrument [Line Items]            
Loss on extinguishment of debt and debt exchanges   $ 90,000,000   $ 90,000,000    
Senior Notes and Debentures [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%   8.50%
Senior Notes and Debentures [Member] | Senior Note Due 9/15/2020 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 1,000,000,000   $ 1,000,000,000    
Debt instrument, maturity date       Sep. 15, 2020    
Interest Rate   8.875%   8.875%   8.875%
Senior Notes and Debentures [Member] | Senior Note Due 9/15/2022 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 2,000,000,000   $ 2,000,000,000    
Debt instrument, maturity date       Sep. 15, 2022    
Interest Rate   10.50%   10.50%   10.50%
Issue price expressed as a percentage of principal amount (in hundredths)   100.00%   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   $ 3,600,000,000    
Debt instrument, maturity date       Sep. 15, 2025    
Interest Rate   11.00%   11.00%   11.00%
Subsidiary Debt [Member] | Subsidiary Senior Note Due 5/15/2027 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 200,000,000   $ 200,000,000    
Debt instrument, maturity date       May 15, 2027    
Interest Rate   6.75%   6.75%   6.75%
Subsidiary Debt [Member] | Subsidiary Senior Note Due 2/1/2028 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 300,000,000   $ 300,000,000    
Debt instrument, maturity date       Feb. 01, 2028    
Interest Rate   6.86%   6.86%   6.86%
Subsidiary Debt [Member] | Subsidiary Senior Note Due 11/15/2031 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 100,000,000   $ 100,000,000    
Debt instrument, maturity date       Nov. 15, 2031    
Interest Rate   8.50%   8.50%   8.50%
JP Morgan Combined Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Acceleration Clause   The maturities of the Term Loan A, the Revolver, and the Term Loan B, 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   $ 500,000,000    
Debt Instrument, Covenant Description   Interest rate margins on the Term Loan B (2.75% for Base Rate borrowings and 3.75% for LIBOR borrowings) are not subject to adjustment. The JPM Credit Agreement contains a covenant that Frontier's Leverage Ratio (as defined in the JPM Credit Agreement) not be above 5.25 to 1.0 initially, migrating to 5.0 to 1.0 beginning in the second quarter of 2018, 4.75 to 1.0 in the second quarter of 2019, and 4.5 to 1.0 in the second quarter of 2020. The security package under the JPM Credit Agreement includes pledges of the equity interests in certain Frontier subsidiaries and guaranties by certain Frontier subsidiaries.        
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Initial Covenant Period   5.25   5.25    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Second Covenant Period   5.0   5.0    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Third Covenant Period   4.75   4.75    
Line Of Credit Facility, Maximum Permitted Leverage Ratio, Fourth Covenant Period   4.5   4.5    
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   $ 850,000,000    
JP Morgan Term Loan A [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   1,625,000,000   1,625,000,000    
Debt instrument, maturity date     Mar. 31, 2021      
JP Morgan Term Loan B [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 1,500,000,000   $ 1,500,000,000    
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%    
CoBank Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin   3.875%        
CoBank Term Loan 2014 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 350,000,000   $ 350,000,000    
Debt instrument, maturity date       Oct. 24, 2019    
Repayment of the outstanding principal balance, quarterly installments amount       $ 9,000,000    
CoBank Term Loan 2016 [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 315,000,000   315,000,000    
Debt instrument, maturity date   Oct. 12, 2021        
Repayment of the outstanding principal balance, quarterly installments amount       $ 8,000,000    
Minimum [Member] | JP Morgan Term Loan A and Revolver [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       0.75%    
Minimum [Member] | JP Morgan Term Loan A and Revolver [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       1.75%    
Minimum [Member] | CoBank Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       1.875%    
Minimum [Member] | CoBank Term Loan 2016 [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       0.875%    
Maximum [Member] | JP Morgan Term Loan A and Revolver [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate Margin       1.75%    
Maximum [Member] | JP Morgan Term Loan A and Revolver [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   $ 6,600,000,000    
CTF Transaction [Member] | Subsidiary Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 600,000,000   $ 600,000,000    
[1] Represents borrowings under the 2016 CoBank Credit Agreement, as defined below.