Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions	1 Months Ended	10 Months Ended	12 Months Ended			36 Months Ended
	May 31, 2019	Oct. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022
CECONY | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)						8.80%
CECONY | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)						8.80%
O&R | NYSPSC | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 5.8	$ 8.0	$ 13.4
O&R | NYSPSC | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 0.7	$ 3.6	$ (7.5)
RECO | Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 19.9
Return on common equity (as a percent)	49.93%
Common equity ratio (as a percent)	10.00%
Subsequent Event | RECO | Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 20.3
Return on common equity (as a percent)		50.16%
Common equity ratio (as a percent)		9.60%
Subsequent Event | RECO | New Jersey Board of Public Utilities | Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 5.8
Return on common equity (as a percent)		8.90%
Common equity ratio (as a percent)		47.14%