Document and Entity Information	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Entity Registrant Name	CINCINNATI BELL INC.
Entity Central Index Key	0000716133
Entity Current Reporting Status	No
Entity Interactive Data Current	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false
Document Type	10-K
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity File Number	1-8519
Entity Tax Identification Number	31-1056105
Entity Address, Address Line One	221 East Fourth Street
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45202
City Area Code	513
Local Phone Number	397-9900
Entity Incorporation, State or Country Code	OH
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	true
Auditor Firm ID	238	34
Auditor Name	PricewaterhouseCoopers LLP	Deloitte & Touche LLP
Auditor Location	Cincinnati, Ohio	Cincinnati, Ohio