Regulatory Matters - Rate Plans and Bill Relief Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	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
Gas | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 3.1
Gas | O&R | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 17.5
Common Equity Ratio, Percentage	50.00%
Return on common equity (as a percent)	10.25%
Gas | O&R | Subsequent Event | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 22.8
Gas | O&R | Subsequent Event | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	19.2
Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 7.5
Electric | O&R | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 10.7
Common Equity Ratio, Percentage	50.00%
Return on common equity (as a percent)	10.25%
Electric | O&R | Subsequent Event | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 34.8
Electric | O&R | Subsequent Event | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 55.0