Stock Plans (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($) shares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Remaining unrecognized compensation cost associated with unvested restricted stock awards	$ 68
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years)	2 years
Compensation expense	$ 9
Performance Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
Performance metric percent	33.30%
Compensation expense	$ 6
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 [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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout range, percent of target units	200.00%
Successor [Member] \| 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) \| shares	15,600,000
Unvested outstanding \| shares	2,500,000

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