Regulatory Matters - Rate Plans (Details) - NYSPSC - Scenario, Forecast - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CECONY | Electric
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in requested rate	$ (14.0)	$ 7.0	$ (12.0)
Requested rate increase (decrease), amount	249.0	359.0	473.0
CECONY | Gas
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in requested rate	(1.0)	(14.0)	(9.0)
Requested rate increase (decrease), amount	$ 154.0	124.0	201.0
O&R | Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		5.8	8.0	$ 13.4
O&R | Gas
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 0.7	$ 3.6	$ (7.5)