Regulatory Matters - COVID-19 Regulatory Matters (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
CECONY
Public Utilities, General Disclosures [Line Items]
Revenues from late payment, disconnection, collection notice and other fees per month	$ 6.0
Earned EAM incentives	46.0
O&R
Public Utilities, General Disclosures [Line Items]
Revenues from late payment, disconnection, collection notice and other fees per month	0.4
Earned EAM incentives	$ 3.0