Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Feb. 29, 2020	Jul. 31, 2019	Jun. 30, 2019	May 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CECONY | NYSPSC | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)			9.75%	8.30%
Common equity ratio (as a percent)			50.00%	47.30%
CECONY | NYSPSC | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 58.0
Increase (decrease) in requested rate					$ 7.0	$ 27.0	(15.0)
Amended rate increase (decrease), amount					270.0	379.0	470.0
CECONY | NYSPSC | Gas
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)			9.75%	8.30%
Common equity ratio (as a percent)			50.00%	47.30%
CECONY | NYSPSC | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							83.0
Increase (decrease) in requested rate					5.0	(4.0)	(4.0)
Amended rate increase (decrease), amount					$ 160.0	134.0	206.0
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 | New Jersey Board of Public Utilities | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)				10.00%
Common equity ratio (as a percent)				49.93%
RECO | New Jersey Board of Public Utilities | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 19.9
Amended rate increase (decrease), amount	$ 20.4
Subsequent Event | RECO | New Jersey Board of Public Utilities | Electric
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)		10.00%
Common equity ratio (as a percent)		49.04%