Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	Amendment No. 1
Document Period End Date	Dec. 31, 2020
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
No Trading Symbol Flag	true
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-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			$ 10.5
Entity Common Stock, Shares Outstanding		104,778,943
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000020520
Document Annual Report	true
Title of 12(b) Security	Common Stock, par value $0.25 per share