Regulatory Matters - Rate Plans and Bill Relief Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2025	Mar. 31, 2025	Jan. 31, 2025
Electric | CECONY | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)	1000.00%
Common equity ratio (percent)	4800.00%
Electric | CECONY | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 3.0
Electric | CECONY | Year 1 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 1,608.0
Electric | CECONY | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			5.0
Electric | CECONY | Year 2 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	937.0
Electric | CECONY | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			9.0
Electric | CECONY | Year 3 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 871.0
Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 17.7
Electric | O&R | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		(13.1)
Electric | O&R | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		24.8
Electric | O&R | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		44.1
Gas | CECONY | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)	1000.00%
Common equity ratio (percent)	4800.00%
Gas | CECONY | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			91.0
Gas | CECONY | Year 1 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 349.0
Gas | CECONY | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			3.0
Gas | CECONY | Year 2 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	269.0
Gas | CECONY | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 9.0
Gas | CECONY | Year 3 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 174.0
Gas | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		10.4
Gas | O&R | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		3.6
Gas | O&R | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		18.0
Gas | O&R | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 16.5