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Commitments And Contingencies (Roll Forward of Vendor Financing liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Commitments And Contingencies [Abstract]
Confirmed Obligations Outstanding, Beginning Balance	$ 263
Invoices confirmed during the year	84	$ 268
Confirmed invoices paid during the year	(331)	(5)
Confirmed Obligations Outstanding, Ending Balance	$ 16	$ 263

X

- Definition

Vendor Financing Liabilities

+ References

No definition available.

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

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- References

No definition available.

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- Definition

Amount of decrease in obligation for supplier finance program from settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 55
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477128/405-50-55-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479468/405-50-50-3

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- Definition

Amount of increase in obligation for supplier finance program.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 55
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477128/405-50-55-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479468/405-50-50-3

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