Document and Entity Information Document	3 Months Ended
	Mar. 31, 2019 $ / shares	Apr. 30, 2019 shares	Dec. 31, 2018 $ / shares
Class of Stock [Line Items]
Entity Registrant Name	CINCINNATI BELL INC.
Entity Central Index Key	0000716133
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding | shares		50,367,297
Fractional Interest in Cumulative Convertible Preferred Stock, Depositary Shares	0.05
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01
Common Stock [Member]
Class of Stock [Line Items]
Trading Symbol	CBB
Preferred Stock [Member]
Class of Stock [Line Items]
Trading Symbol	CBB.PB