Employee Benefits (Details) - Summary of employee benefits for defined contribution plan - ILS (₪) ₪ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of employee benefits for defined contribution plan [Abstract]
Amount recognized as an expense for a defined contribution plan	₪ 223	₪ 232	₪ 228

Amount recognized an expenses for defined contribution plan.

No definition available.

Name:	bcom_ExpenseForDefinedContributionPlan
Namespace Prefix:	bcom_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant