Document and Entity Information - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		104,779
Title of 12(g) Security	Common Stock, par value $0.25 per share
Amendment Flag	false
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000020520