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Income Taxes (Narrative) (Details) $ in Millions	Sep. 30, 2025 USD ($)
Income Taxes [Abstract]
Valuation allowance	$ 365
Valuation allowance, net of federal benefit	$ 288

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- Definition

Deferred Tax Assets, Valuation Allowance, Net Of Federal Benefit

+ References

No definition available.

+ Details

Name:	fybr_DeferredTaxAssetsValuationAllowanceNetOfFederalBenefit
Namespace Prefix:	fybr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration