| Document and Entity Information | Dec. 23, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 23, 2019 |
| Entity Registrant Name | Cincinnati Bell Inc. |
| Entity Incorporation, State or Country Code | OH |
| Entity File Number | 001-8519 |
| 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 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000716133 |
| Title of 12(b) Security | Common Shares ($0.01 par value) |
| Trading Symbol | CBB |
| Security Exchange Name | NYSE |
