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Investment And Other Income, Net (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investment And Other Income, Net [Abstract] |  |  |
Special termination benefit enhancements related to a voluntary separation plan, pension plan | $ 45 |  |
OPEB remeasurement gain (loss) | 35 | $ (3) | $ 248
Pension remeasurement (loss) gain | $ (45) | $ 202 | $ 218

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- Definition OPEB Remeasurement + References No definition available. + Details
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- Definition Pension Remeasurement Gain (Loss) + References No definition available. + Details
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Namespace Prefix: | fybr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Special Termination Benefit Enhancements, Pension Plan Remeasurement + References No definition available. + Details
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Namespace Prefix: | fybr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OtherNonoperatingIncomeExpenseAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration