Document and Entity Information - USD ($)	Dec. 31, 2019	Apr. 27, 2020	Jun. 30, 2019
Entity Listings [Line Items]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends our Annual Report on Form 10-K for the fiscal year ended December 31, 2019, that was filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2020 (the “Form 10-K”). We are filing this Amendment to provide the information required by Part III of Form 10-K previously omitted from the Form 10-K in accordance with General Instruction G.(3) to Form 10-K. This Amendment also amends Item 15 of Part IV of the Form 10-K solely to include as exhibits the new certifications required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment. Except as expressly stated, this Amendment does not reflect events occurring after the filing of the Form 10-K or modify or update in any way any of the other items or disclosures contained in the Form 10-K, including, without limitation, the consolidated financial statements and the related footnotes. Accordingly, this Amendment should be read in conjunction with the Form 10-K and the Company’s other filings with the SEC subsequent to the filing of the Form 10-K.
Document Period End Date	Dec. 31, 2019
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Registrant Name	FRONTIER COMMUNICATIONS CORP
Entity Incorporation, State or Country Code	DE
Entity File Number	001-11001
Entity Tax Identification Number	06-0619596
Entity Address, Address Line One	401 Merritt 7
Entity Address, City or Town	Norwalk
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06851
City Area Code	203
Local Phone Number	614-5600
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Public Float			$ 181,402,000
Entity Common Stock, Shares Outstanding		104,987,947
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000020520
Document Annual Report	true
Preferred Stock [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Common Stock [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $0.25 per share(1)
Trading Symbol	FTR