Regulatory Matters - Rate Plans and Bill Relief Narrative (Details) - USD ($) $ in Millions		1 Months Ended
	Aug. 07, 2025	Jan. 31, 2026	Jun. 30, 2025	May 31, 2025	May 30, 2025	Apr. 30, 2025	Mar. 31, 2025	Jan. 31, 2025
Electric | CECONY
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 319.0
Return on common equity (as a percent)				930.00%		1000.00%
Common equity ratio (percent)				4800.00%		4800.00%
Electric | CECONY | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 1,608.0		$ 3.0
Electric | CECONY | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						937.0		5.0
Electric | CECONY | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 871.0		9.0
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
Electric | RECO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 18.7
Return on common equity (as a percent)			10.30%
Common equity ratio (percent)			50.15%
Electric | RECO | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 23.3
Common equity ratio (percent)	1030.00%	50.12%
Gas | CECONY
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 45.0
Return on common equity (as a percent)					930.00%	1000.00%
Common equity ratio (percent)					4800.00%	4800.00%
Gas | CECONY | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 349.0		91.0
Gas | CECONY | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						269.0		3.0
Gas | CECONY | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 174.0		$ 9.0
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
Steam | CECONY
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 332.0