Regulatory Matters - Energy Efficiency Formula Rate (Details)	Feb. 03, 2022
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Basis points for ComEd's Revenue Requirement	580

Maximum basis points that can be added to the average rate on 30-year treasury notes, to determine the allowed ROE for ComEd's revenue requirement.

No definition available.

Name:	exc_BasispointsforComEdsRevenueRequirement
Namespace Prefix:	exc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration