Debt - Cincinnati Bell Telephone Notes (Details)	Apr. 21, 2017
Debt Disclosure [Abstract]
Debt Instrument, Number of Registrants	300

The number of record holders of a particular class of debt securities.

No definition available.

Name:	cbb_DebtInstrumentNumberofRegistrants
Namespace Prefix:	cbb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant