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Stock Plans (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Frontier Communications Parent, Inc. 2021 Management Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant under the plan (in shares) 15,600,000    
Unvested outstanding 4,180,000    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years 3 years 3 years
Remaining unrecognized compensation cost associated with unvested restricted stock awards $ 55    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 2 years    
Cash compensation $ 19    
Restricted Stock [Member] | Board of Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 1    
Performance Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Measurement period 3 years    
Performance metric percent 33.30%    
Conversion of stock, ratio 1    
Compensation expense $ 31 $ 16  
Minimum [Member] | Performance Stock [Member] | PSUs 2021 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range, percent of target units 0.00%    
Minimum [Member] | Performance Stock [Member] | PSUs 2022 And 2023 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range, percent of target units 0.00%    
Maximum [Member] | Performance Stock [Member] | PSUs 2021 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range, percent of target units 300.00%    
Maximum [Member] | Performance Stock [Member] | PSUs 2022 And 2023 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range, percent of target units 200.00%