Regulatory Matters - Rate Plans and Bill Relief Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	May 31, 2024	Apr. 30, 2024	Mar. 31, 2024	Jan. 31, 2024
O&R
Public Utilities, General Disclosures [Line Items]
Bill relief program, amount received			$ 9.0
CECONY
Public Utilities, General Disclosures [Line Items]
Bill relief program, amount received			$ 91.0
Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ (27.6)	$ 10.7		$ 7.5
Return on common equity (as a percent)	9.50%	10.25%
Common equity ratio (percent)	48.00%	50.00%
Electric | O&R | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 34.8
Electric | O&R | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		55.0
Gas | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ (2.9)	$ 17.5		$ 3.1
Return on common equity (as a percent)	9.50%	10.25%
Common equity ratio (percent)	48.00%	50.00%
Gas | O&R | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 22.8
Gas | O&R | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 19.2