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Investment And Other Income (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Successor [Member]
OPEB Remeasurement	$ 54

X

- Definition

OPEB Remeasurement

+ References

No definition available.

+ Details

Name:	fybr_OpebRemeasurement
Namespace Prefix:	fybr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_StatementScenarioAxis=fybr_Successor1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: