Document and Entity Information - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-11001
Entity Registrant Name	FRONTIER COMMUNICATIONS CORPORATION
Entity Incorporation, State or Country Code	DE
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
ICFR Auditor Attestation Flag	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 10.5
Entity Common Stock, Shares Outstanding		104,779
Title of 12(g) Security	Common Stock, par value $0.25 per share
Documents Incorporated By Reference	DOCUMENT INCORPORATED BY REFERENCEItems 10, 11, 12, 13 and 14 of Part III will be incorporated by reference from a Form 10K/A to be filed with the Securities and Exchange Commission.
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0000020520